Try doing 3 sets of 10 reps.
I am a big boy (5'10.5" and 250lbs). I have gained over 2 inches on my chest in the past year with this philosophy.
8 week routine:
Flat barbell bench
2-3 warm up sets: 135 for 15-20 reps
225 for 10
275 for 6
3 sets of 10 @ 315.
Note: You should not be able to complete your third set your first time. It should take several weeks to build up.
incline dumbbells: 3 sets of 10 reps increasing the weight every set.
cables: 2 sets of 10
pushups: feet up on a bench 2 sets,
each till you can no longer go
HEAVY flat barbell bench
2-3 warm-up sets.
then as many as you can do for sets of 6. go until you cant move up and get 6 reps.
Same as above for incline, cables, and pushups.
weeks 6-8: NO FLAT BENCH
incline: 3 sets of 10 (same as above)
decline: 3 sets of 10 or sets of 10 as high as you can go. Stop once you cant get 10!
cables, flat pushups.
If you like this taylor it to your weights.
p.s. i have more variations to this if you so desire.