Is your butt good and lean? Some guys have lots of glute muscle, but have a layer of fat over it; it's just where they are genetically programmed to store it. 1" may be plenty, but be sure you are getting well into the muscle. Glute shots are awkward for me to do myself. I've always used quads or delts.
lean but muscle. want to make sure i get it deep. my quads are building up some tissue now so i wanted a change up so i went to get the 1.5 but of course they did not have.