I have a problem...The size of my back, shoulders, and arms are completly unproportional to my chest. I have a huge back and crazy ass wide shoulders with 17inch arms unpumped. I'm only 18 and being a short guy at 5'6 weighing about 165/12%bf I seem to have a problem with building mass on my chest. Anyone have any suggestions. My chest workout looks like this:

Incline bench warm up, 11, 9, 7
dumbell presses 11, 9, 7
flat bench 11, 9, 7
then the machine where you pull ur arms together to meet in the middle of ur chest...superset
I like odd numbers...