I wonder if I was having problems trying to pin my quad after a leg day…assuming you're pinning a TRT dose into delt/quad/chest, try using 1ml 5/16 or 1/2 inch syringes with a 27g needle. should work no problem. if you're going in your glute you're going to need a 25g 1 or 1.5". GSO is thicker for sure but im having no issues. where are you pinning?