Shit man, that's a pretty extreme thought for trying to correct your genetics. I would be more inclined to shoot some winny or something into the smaller pec, rather than try to deteriorate muscle tissue. Hell, shoot some sust into that little pec, if you can stand the pain, and the swelling oughta even them out if you need something to happen in a hurry.
Don't take my advice without asking around some more, I am only speculating really.