Geez-o. Can't we have one fight-free thread?
Irish, I'm with Supersizeme: you're not doing near enough reps. 3 rep sets are nice and all, but if development is a problem it's clearly not enough.
I'd restructure your routine such that you only did a handful of hard sets per workout, like low-incline press x 1-2 sets to failure (or close thereto), parallel dip x 1 set to failure (or close), etc. I'd at least try 8 reps per set...10 would be better. Emphasize the negative somewhat, and work toward moving more weight each workout.
You might also address your set-up; i.e., are you a pec bench presser?