If you are looking for another site to inject, I would suggest Ventrol Gluteal. It is my favorite BY FAR, next is dorsal gluteal (difficult to do by myself), then quads, then delts. Again, the VG is WAAAAAAAAY better for me. I have never had any PIP and I can not feel anything (literally) after extracting the needle. That being said, it would seem that your issue(s) may not necessarily be location so you will want to focus on that. Just wanted to suggest another location (did I mention it was by favorite, by far?).