Switch to ventrogluteal with a 25g Should find that will ease the PIP. Enanthate has a slightly shorter half life to cyp (not by much) but some people react quite strongly to small changes when pinning including - different esters, solvents, carrier oils and concentrations. I can pin 2ml of test E at once without issue but if i pin 1/2 a ml of Sus i have swelling and PIP for days