Mission to loose 20lbs by 30th June- Join me please?

I have P90X, Insanity, and T-25 all here with me. I'm 6'0" and started at 244lb, and down to 207lb, with goal of 185lbs. I was working out at the gym previously, but just started doing a hybrid of the home video programs above 3 weeks ago. Currently I am doing the 3 P90X lifting routines 3 days a week, and doing either insanity or T-25 3 days a week in between P90X.
Here is some interesting information I took just a couple days ago from my HR monitor as I did each of these exercises over 3 consecutive days.

1. Insanity Max Plyo... 40 min... 620 cal burned (15.5 cal/min)
2. P90X Shoulders and Arms w/ Ab Ripper X...... 75 min......757 cal burned (10.1 cal/min)
3. T-25 Beta Speed 1.0......25 min..... 442 cal burned (17.7 cal/min)

T-25 will give you more efficient calorie burning than Insanity since you don't have the stretching routines in the middle. And while P90X lifting routines are the least efficient in term of cal burned/min... You want to do those. For every pound of muscle you build... you burn 30 more calories per day from your resting BMR.

I highly recommend you get a HR monitor so you can keep track of your calories burned. I actually lost a lot of weight by just eating healthy and working out, but then I hit a plateau. No matter how hard I worked out and clean I ate, I couldn't lose weight for about 6 weeks. Then I started doing the home videos, used my HR monitor, and got a digital scale to weigh my food that I made at home. The problem was that I was not eating enough calories and my body went into starvation mode and tried to hang on the the fat I had. I lost 5 lbs the first week, and lose almost 1/2 lb every day now. I also changed my goals to 50% protein 30% carbs and 20% fat (recommended in Fat Shredder Phase in P90X nutrition plan). Once I hit my weight loss goal, I will up my calories, carbs, and fat, to start building muscle. Carbs are what give your body and muscles their primary fuel. (I am also in grad school, med school, and this is simple biochemistry). But excess carbs also get stored as fat.

So I make sure I do the 3 P90X lifting routines every week, and do either Insanity or T-25 depending on how I'm feeling or how much time I have. I then just adjust my calorie intake appropriately. I can do this since I use the HR monitor and scale, so I know exactly the difference in my calories consumed and burned.

My BMR is 2450... and I try to NET 1350 - 1550 calories per day. (YES... YOU MUST EAT BACK ALL OF THE CALORIES YOU BURN FROM EXERCISE!!!!) If your NET falls below 1200 cal, you are in danger of your body trying to preserve your fat and thus preventing you lose weight. (of course this can not be the case if you are 5'0" and weigh 100 lbs).

Hope this helps!