I wonder if we got different batches. I wasn't getting anything when I pinned but bad pip for days after, real sore. Nothing I couldn't handle but I just chalked it up to the fact that I hadn't pinned in over a year or something, thought at first I had just went to deep, but 5 weeks straight and still happening. Last week I switched gear after my blood was drawn and the other day added a 2nd compound (pinning 2ml and a total of 500mg at once) and no PIP at all, so I don't think it was anything I was doing.
I can't narrow it down to what it was so im not blaming anyone or anything, just telling my experience. Tmac had similar PIP issues