Noting like the "snap, crackle and pop" of putting the pin in, is there ? This is super common. I have moved to 25g pins. This helps. ART , foam rolling and deep tissue massage helps. Using more sites also helps. I Had bad scar tissue in my delts and glutes a few years back. Over time, it gets better with time off. But even just 1x wk into a site has caused problems for me over time. So when I can, I have spread out my shots even more. Lats, quads, delts, Triceps and biceps. Even Rear delts. You cant use much in the smaller sites, so with a rear delt, I might put in 1cc at the most. Then end up using a couple smaller sites to get my daily shot in. Really to fix this, you will need time off of the site that is causing you the problem.