I cycle between quads, pecs, and glutes. That lets me hit one muscle group once per week to keep scar tissue down. I kinda want to try calves, but I dont want to do it unless it's with something tiny like an insulin syringe lol
I've moved to SubQ but when running anything over TRT doses you can run out of spots just as quickly. I usually do two injects when doing anything over 1cc and make sure to move the needle in the fat as I inject to space the oil out best I can as it seems to help absorption.