I've been using the Regimen for a year now. Acne has stayed the same and my PIH never seems to go away. Ive been getting chemical peels and extractions this summer, but that doesn't seem to be helping either. I'm looking for advice on what would work best for my skin situation.
Hey, I got PIH too so I understand just how distressing it can be. You mentioned chemical peels but have you had a TCA peel, it's deep, layers of skin ends up peeling off (ew I know).
If you got the cash then Fraxel laser might help, other then that it's just a lengthy process that takes patience and time.
I have been using a Copper Peptide serum which is aimed at promoting wound healing but so far I'm not seeing any promosing progress. 
Your skin isn't that bad, Paulaschoice.com have BHA/AHA products which can help fade down marks. Azealic acid cream is also used on acne but people claim it helps inhibit the melanin production/colour of PIH.
Goodluck 