Why take anything at all. You weigh 178lbs at 6'. Regardless of your bodyfat that really shouldn't make anyone start to question if you are using or not.

Why not just modify your diet and eat more to gain< you should be able to put on another 15-20lbs without major problems. You'll gain nothing, AAS or not, if you don't eat more.

Oh, and big fifference between 7% and 10% bodyfat!