I'm 6'8 and ~245lbs. and am having difficulty developing my chest. Bench: 270 Squat: 350 one of my friends said that while doing flat bench DB press to go as far down as you can.. and i have just been going 90 degrees. Also he said while doing barbell bench to use a wider grip (here i just go 90 degrees like a goal post). how much does this make a difference in developing your chest?