I have had a lot of problems building my chest mass. My strength has increased, but I fear that my front delts are doing all the work. I keep on getting bigger in the outter and upper parts of my chest, but can't build the bottom or middle. Also, my arms continue to grow and they are too big compared to my chest. When I do a hard chest workout, I really feel it near my armpit/delts (rotator cuff maybe??) and tris...not so much in my chest. I currently have been switching up my routine, but this is what I used to do:

4 sets of 8-10 reps flat bench
4 sets of 8-10 reps decline bench
5 sets of 8-12 decline flyes
3 sets of seated pec deck
3 sets of cable crossovers
dips to failure

I stopped doing incline, since I do not want to build my upper chest anymore...except for the middle upper. I am basically the opposite of everyone else. I can build upper and outter chest, but not middle and lower. Any advice or suggestions will be greatly appreciated!!!