I have a Ciener conversion on an old G19 frame that I bought in 2000 and an Advantage Arms converter on a Gen III Glock 22 frame that I probably got in 2014 or so.
Both run best with plated round nose bullets over 1,200 fps. My favorite ammo is CCI Mini Mags. I still get some malfunctions caused by the slide not going fully into battery.
"About 6 months ago I switched to Cherry Balmz Rimfire Remedy for lubrication, it seemed to do okay." -- I had never heard of Rimfire Remedy before. I think I'm going to order some and try it out.