I used to use 1" 25g needles on my quads (deep). After reading many posts on this site, I switched to 1/2" 28g insulin needles on my delt (shallow) and now pinning is painless. At times, on my quad with the 1" 25g, it would feel uncomfortable with some pain and a LOT of nerves (probably because it was 25g). I dreaded watching the 1" needle go into my quad and almost stopping sometimes because of how deep I was watching it go in. Now I don't feel any pain pinning delts. I don't know what pinning shallow will do for my labs, but I feel much better pinning now and look forward to it. I changed my protocol and I feel much better, so I can't really say if it was the deep/shallow, protocol change, or the combination. Whatever it is, though, I'm gonna keep doing this knowing I feel great now. Sometimes it takes some time to figure out what works best for you and what feels most comfortable for you, but when you find it it will be hard to want to switch from that. I hope this helps! Good luck!