I try to stick with 1600 when dieting (sitting job, really hard to burn off unless I do excessive sports) but I'm impressed when you do 1700 and daily Gym. That really should drop pounds quickly.

How long have you been doing that diet? I found that after a month or latest two, the body will adapt. Best results for me where doing 2000/1200 days or so, so basically half/half. Seemed to me the body wouldn't throttle down.

Check out reverse dieting also if the term isn't familiar to you already.