My experience with short pins and site injections: years of subcutaneous lumps and most likely cysts. My advice to any young guy, use a minimum of 1 inch pins and use mainly glute injection areas. Delts are good until you start developing scar tissue, which seemed to happen quickly for me. Avoid bicep lat, calf injects. My pecs still have bb sized lumps in old inject spots, traps injects never bothered me. You're nuts if you inject in lats.