Forget about upper,lower,middle. In fact, forget about chest all together here.
From your responses I'm guessing you don't understand some basic physiology and interactions. Your chest will only 'grow' to a point that your shoulders and back will allow.
Seeing as you made no mention of these I'm assuming you aren't aware. For one month do NO chest exercises. That's right--none.
Do all of the chin-ups, push-presses, rows, and close grip benches your workout will stand.
I'll bet when you go back a month from now, you'll find your bench has gone up--your posture will have improved, and your chance of injury has lessened because you have brought back some symmetry to your musculature.
Try it. If you don't improve PM me and I'll make sure you get dinner on me at any of your area eateries