Try a few different things. Changing the entire routine up can help also. Work chest with back. Do super sets, drop sets, reverse pyramid, high reps, DC training ...etc
This is the routine I'm on now. I will only highlight chest though.
Monday is upper body day. 1 exercise per upper body muscle. For chest, I will do heavy weight low rep of BB incline sometimes followed by a flat bench DB fly.
Then on Thursday I hit chest and back or chest and triceps and I will do my version of a full chest routine which includes this:
BB flat
DB incline
Machine decline
Incline DB flys
Cable flys
I change reps weekly so can't really tell you what to do there....but...Monday I go heavy, then my chest day I go higher reps with drop sets, negatives involved in everything.
http://anabolicminds.com/forum/showpost.php?p=5383814