I asked a very similar question a few months back...
but if your IGF is in AA, don't mix it with anything that is BW... Other then that I think You'd be fine.
But I ended up pinning everything seperately.. cause at the end of the day slin pins are cheap, and hgh and igf are expensive...
I've been poking myself with slin pins on average of 2 - 6 times a day.. and I haven't noticed any scare tissue yet, so I don't consider that an issue either. I use bd ultra fines 29-30g, short tips.
For the pgf you should be shooting IM anyway, in which case you'll need a slin pin with slip tips, so you can switch to a 25g x 1" suitable for injection.. and i suppose if your igf is in bw... and your hitting up spot injections, I'd give that a whirl. Saves pinning the bi's twice.. I hate pinning biceps.
Personal note, I stopped pgf pretty early on.. didnt like feeling like I was about to puke... (it wasn't painful though, like I had read about.. just upset stomach.) I'll try again perhaps when I'm cut down more.
peace.