I do wide and narrow bench presses and i have bigger pecs on the outside than the inside. They slant from the outsides to only a small region next to the sternum which doesn't pop out much. It doesn't look too bad but I was wondering whether the exercise has only been working the outside portion of the muscle and not the inner. Is there any way I can also encourage the inner portion of the sternal pec to grow? Would it be dumbbell flys?