Macros Suggestions?

I'm 5'5" and 175 lbs (give or take, I fluctuate between 170 and 176). I started my journey over a year ago at 250 lbs. For the last month and a half, I have been hitting the gym pretty hard (4-5, sometimes 6 days per week) for about an hour. I combine cardio with resistance/strength training, and I have a personal trainer. I usually burn about 400-600 calories per hour doing these things (I use a HRM).

I recently upped my caloric intake after experiencing a three-month plateau, which I'm still "sort of" in. I have noticed, in the last month, a visible change in my body, as well as the numbers coming out alright.

4/2/12
Weight - 178.8
Body Fat % - 31.8%
BMI - 29.5
Chest - 39.5"
Arms - 11.7"
Waist - 34.5"
Hips - 39.7"
Thighs - 23.1"
Calves - 17.1"

5/5/12
Weight - 175.8
Body Fat % - 30.8%
BMI - 29.2
Chest - 38.2"
Arms - 11.3"
Waist - 33"
Hips - 36"
Thighs - 22.2"
Calves 16.1"

However, I'm not sure why my weight refuses to drop. Even with the same body shape and frame (when I was 20, I'm now 24), I weighed around 150, which is my goal weight. But I don't want to keep focusing on the goal weight if my improvement is what I think it should be...I just don't know if my improvement, at this point in my journey, is good, bad, or normal.

Essentially, what I'm asking is, am I doing something wrong to not make the scale move (I'm not THAT worried about that number, but I'd like to at least get below 170), am I eating wrong, am I not working out often enough, etc?

Thoughts? Any help is appreciated, and my diary is public for all to view.