strictlypromenade, can you post photos of the firing pin strikes on the .22LR casings?

And what brand and lb spring did you try? And do you know what the original S&W spring weight is?

My notes say that someone in this forum had success with the Tandemkross Fire Starter #TK27N02329SLV1. It's on my list if I have firing pin problems.

And I don't know whether Wolff sells firing pin springs, but I had the opposite problem with my Advantage Arms Glock 17/9mm to .22 LR conversion kit. I had better, but not quite good enough, results by using lighter weight springs. I got my Wolff springs from MidwayUSA, but I think they're all over Ebay, too.