bumping to hear some useful information on this -- i've been working hard to lower myself from a current estimated 21-23% to 18% goal and feel "stuck" also

Can anyone give me some advice regarding lowering body fat%?
Right now I'm about 27-28%, (although this is based on pictures from 17th April and one from mid May, so it might be slightly lower) but I would like to get down to around 20-22%.
My current stats are as follows:
Height 5'4'
Weight: hovering between 126-127.5lbs.
Bust:35.5 inches
Waist: 27.9 inches
Hips: 38.5 inches

I train 3-4 times per week, the Strong Curves body-weight program as I can't get to a gym right now, but I try to apply the rule of progressive overload by doing more difficult variations. I'm on week 12 of this program right now and with it, along with Mark Lauren's body by You program, I have made good strength gains - I can do 5 full push-ups whereas I couldn't do any before for example. Comparing my starting progress pics to my newest ones from April/May (I haven't taken new ones yet), there is a difference in physical appearance.
I am looking to repeat this program as I can't get to a gym right now, but only the last two stages (weeks 5-8 and weeks 9-12) and using more challenging variations on certain moves. I will then do the beginner's lifting program.
I plan on integrating more HIIT sessions as well and more walks.
As I am back home from university, I am more sedentary than I am there - I would usually be walking to/from and around campus and cooking and cleaning etc. To compensate for my lessened steady sate cardio, I am thinking about going for walks or maybe jogging.

In regards to food intake, my calories are set to 1600 per day, aiming to reach 45% carbs, 30% fat and 25% protein. So ideally, 180g carbs, 53g fat and 100g protein. Sometimes, I will be over on protein, but this is obviously no bad thing. Last week, my percentages were 45% carbs, 29% fat and 26% protein.
I use a food scale and measuring jug. I am diligent about this for breakfast and lunch, but could tighten this up for dinner.
My food intake is good Monday to Wednesday. Thursday and Friday is also good but we have a Chinese takeaway for dinner on Thursday which I spread out for dinner on Thursday and Friday. Saturday and Sunday are the biggest area for improvement.
I think upping my protein percentage and eliminating takeaways at the weekend will be the best solution here.

My diary is open so I would like your opinions.

I think these are the areas for improvement:
Up protein to 30% perhaps
Eliminate takeaways at the weekend
Add HIIT sessions
Moderate cardio such as walking and swimming perhaps
Consistent strength training.
Accurate food measuring.

I usually eat between 1450 to 1600 a day, and macros are generally ok.
I have looked at TDEE calculators such as:
http://scoobysworkshop.com/calorie-calculator/
http://www.exrx.net/Calculators/CalRequire.html

I put myself at moderate activity levels and they estimate me at 2190 and 2280 repectively to maintain. So TDEE - 15% = 1750-1800 calories.
On the other hand, http://iifym.com/iifym-calculator/ gives me between 1800-1898 to maintain. So TDEE -15% = about 1600

My question is, is the reason why I haven't lost any weight because I have been eating more than I think due to inaccurate measuring and eating out/takeaways or am I in fact eating slightly too little? Also which calculation is best for fat loss?

Can anyone give me some advice regarding lowering body fat%?
Right now I'm about 27-28%, (although this is based on pictures from 17th April and one from mid May, so it might be slightly lower) but I would like to get down to around 20-22%.
My current stats are as follows:
Height 5'4'
Weight: hovering between 126-127.5lbs.
Bust:35.5 inches
Waist: 27.9 inches
Hips: 38.5 inches

I train 3-4 times per week, the Strong Curves body-weight program as I can't get to a gym right now, but I try to apply the rule of progressive overload by doing more difficult variations. I'm on week 12 of this program right now and with it, along with Mark Lauren's body by You program, I have made good strength gains - I can do 5 full push-ups whereas I couldn't do any before for example. Comparing my starting progress pics to my newest ones from April/May (I haven't taken new ones yet), there is a difference in physical appearance.
I am looking to repeat this program as I can't get to a gym right now, but only the last two stages (weeks 5-8 and weeks 9-12) and using more challenging variations on certain moves. I will then do the beginner's lifting program.
I plan on integrating more HIIT sessions as well and more walks.
As I am back home from university, I am more sedentary than I am there - I would usually be walking to/from and around campus and cooking and cleaning etc. To compensate for my lessened steady sate cardio, I am thinking about going for walks or maybe jogging.

In regards to food intake, my calories are set to 1600 per day, aiming to reach 45% carbs, 30% fat and 25% protein. So ideally, 180g carbs, 53g fat and 100g protein. Sometimes, I will be over on protein, but this is obviously no bad thing. Last week, my percentages were 45% carbs, 29% fat and 26% protein.
I use a food scale and measuring jug. I am diligent about this for breakfast and lunch, but could tighten this up for dinner.
My food intake is good Monday to Wednesday. Thursday and Friday is also good but we have a Chinese takeaway for dinner on Thursday which I spread out for dinner on Thursday and Friday. Saturday and Sunday are the biggest area for improvement.
I think upping my protein percentage and eliminating takeaways at the weekend will be the best solution here.

My diary is open so I would like your opinions.

I think these are the areas for improvement:
Up protein to 30% perhaps
Eliminate takeaways at the weekend
Add HIIT sessions
Moderate cardio such as walking and swimming perhaps
Consistent strength training.
Accurate food measuring.

I usually eat between 1450 to 1600 a day, and macros are generally ok.
I have looked at TDEE calculators such as:
http://scoobysworkshop.com/calorie-calculator/
http://www.exrx.net/Calculators/CalRequire.html

I put myself at moderate activity levels and they estimate me at 2190 and 2280 repectively to maintain. So TDEE - 15% = 1750-1800 calories.
On the other hand, http://iifym.com/iifym-calculator/ gives me between 1800-1898 to maintain. So TDEE -15% = about 1600

My question is, is the reason why I haven't lost any weight because I have been eating more than I think due to inaccurate measuring and eating out/takeaways or am I in fact eating slightly too little? Also which calculation is best for fat loss?

It will not be because you are eating too little.

On looking at your diary, you have quite a few entries that have incorrect (or no) macros and also quite a lot of take-out/restaurant food. It's not that there is anything wrong with take out food in itself, but that it is very hard to be confident of the calorie count and can lead to inaccuracies.

The best calculation to work out your TDEE is your actual results. If you are not losing weight at an intake level (baring normal fluctuations), you are at maintenance.

You have really have two choices. Eat at maintenance and recomp (where you slowly decrease body fat and increase muscle mass), or eat at a deficit, which, if you are currently maintaining, will mean that you have to drop your intake by a bit.

If you do not want to stop eating out as much, then I would suggest dropping your intake by a bit. I would do this by dropping your carbs down initially by about 25g as your protein is already a bit on the low side (although it is higher than it shows as some of the macros are missing as noted above).

It is not much of a drop in calories, but sometimes, that is all that is needed to get the weight loss going again, and dropping too low is generally, not a good idea.

I would also increase your activity - add some walks in, or as you mentioned, HIIT.

Combining a slight decrease in intake (to account for the inaccuracies) with an increase in activity should create a deficit again.

Thanks. I have decided to cut out the takeout food this week and possibly next week to concentrate on accurate calories and macros; keeping my intake at 1550-1600 for now to see what that does. I am also going to increase protein as you suggest.

As for activity, am I am going to start doing regular walks seeing as I would be quite sedentary as I'm finished at university for a few months. Just walked for 4 miles for and hour and a half around my village and reservoir/country park seeing as it's a nice day! Probably wouldn't go that far everyday though. Maybe a couple of miles.
Then strength training 3-4 times a week - just body-weight for now as I can't get to a gym just yet (I am getting some adjustable dumbbells though soon).
Then HIIT sessions a couple of times a week on my days off from strength training. I like to do a bit of Pilates and Yoga (the latter sometimes after strength training) as well, but they aren't really very strenuous unless you're doing more advanced types.
I would like to drop about 4-6 pounds, but it's really only body composition/BF% that I'm focused on now to be honest.

Edit: I there a particular number range that I should aim for on my protein intake by the way?