I never get lumps, some buddies of mine do and get leaking. I figure they were not going deep enough.
I used to when I first started pinning two years ago trt. I was newb though. Now though, never if ever do i get PIP, no leaking, no lumps. I hit the muscle and I can feel when I hit it vs when the needle is going through subq tissue.
Even today with the slin pin, so far no pip, nothing leaked, i jabbed it in hard and deep and it did hit muscle, there's a different feel I get when pushing it in if it's not in muscle and i can feel it oozing inside (thats when i would have messed up).
This is a longer slin pin not those super short ones. I have no fat on my tighs/hips, rock solid there lol. I guess I found a new shooting spot.
I've never used 1.5" :-/