PGF2A is a relatively new and experimental concept. I claim to have gained strength in my biceps and triceps from 2 weeks of use... I have never injected in chest, but others have. It may actually make the side that you inject in look smaller than the other side due to its ability to oxidise localized fat... Using a barbell and staying away from dumbells should even out your chest...
Or try some pgf2a and tell us about your results.. we are ALL still learning about this stuff. You either love it or you hate it and most love it... but you have to inject nearly 40-50x per week to see the best results... but its only with a slin pin.
-Stew