Cycle your carbs
Here's how I lose bodyfat--I don't really "diet", per se, I concentrate more on cycling my carbs (of course there are days with caloric deficits). I try to keep my protein at 2g per lb of BW/day and make sure I get plenty of EFA's, including 3g of EPA/DHA combined and 2tbs of flax oil. Other than that I do not count calories, I just rely on my carb restriction/refeeds. I have 3 types of carb days when dieting/carb cycling:
A-I eat only .5g per lb bodyweight
B-1g per lb of bodyweight
C-2g per lb of BW
Monday-A
Tues-A
Wed-B
Thurs-A
Fri-A
Sat-B
Sun-C
Basically I do the super low carb days for 2 days then a normal carb day, repeat and on sunday I refeed. This is really easy after the first week and it works for me.
Also, you may wanna switch the deca to some tren if you're dieting. Tren is supposed to be awesome for body recomp.
HTH.