IPOARM/TDEE question (sorry!)

whatsername2312

Hi
I've lost about 30lb so far. Most of this was last year however and I have only lost 7lbs or so since last summer. I'm 5ft 7 and 172lbs. I would like to be healthy BMI but I am more focused on losing body fat. BF is 31% according to my scales at home, which I know may not be that accurate, but measurement ones do not do me justice as I carry nearly all my weight in my stomach
Anyway, I recently completed the 30DS and have become more toned but not lost weight OR inches. I am starting a new workout regime this week, doing the Spartacus workout (awesome btw) 3 days a week, and doing lifting two days a week (aiming heavy at about 5 reps, no more than 10 but starting lighter to perfect form). I'll be doing squats, deadlifts, rows, bench press, overhead press, dips and maybe some ab work. I have done some weightlifting before but was doing 12 - 15 reps. I'm also lifting at home, so max weight I can build up to is ~40kg. I may also try and run once or twice a week if I have time (but atm this is unlikely). I walk to uni up a very steep hill all the way for a mile-ish, and try to go as fast as I can (I get very warm). I am also on my feet a lot during the day in the lab. Aside from this, when I don't go to uni (3 days a week) I am a bit of a couch potato, sat at the computer doing work etc. So as you can see my activity levels vary a lot.
Anyway, I have been eating at 1700 calories or so for the last few weeks, 1800 before that and not eating exercise calories back. I have been trying to eat more protein (at least 100g a day), and I do like to eat 'treats' now and then, though I have been trying to cut these out. My question is do you think this is the right amount of calories for this workout plan? I have been flitting around with the amount of calories I eat after discovering TDEE a few months ago - but I haven't actually lost any weight this way. I'm disappointed because the concept made a lot of sense. Am I doing it wrong? Should I go back to eating BMR on rest days and eating exercise calories back on workout days? (This is how I have lost most of my weight). I want to know how much to eat so I will be more motivated to sticking to it (which I have been struggling with lately).
Sorry for long post, and thanks in advance for any advice