If you would like more pecs, Id consider more benchpress of all kinds.
Peak contraction w/ a F'n massive load of weight off the pins may help U find what UR lookin for.
I've never shot a peck. If I ever get it in my head to do it; I'll take a look @ the nerve routes 1st in something like Greys Anatomy-Twingle-Twingle, Jerk, jump, shit!Ouch!
Oh, just go slow, it'll Be Ok, huh?
All shots cause some inflammation & swelling, right? (Esp prop & stanoz)
Temporary? But, So is everything else in Life.
The Medical Texts say hit: hips, Glute medius, delts, & outside of the quads. Relatively nerve free, and no big blood rivers flowin there.
Fact is guys who hit glutes over years, DO got BIG HIPS- but They squat-a-Lot 2.
Stick with what don't cause a problem B4 you go all acupuncture crazy.