mess around with second guessing, just replace. Sounds like you may have a cheaply made unit or not. I've purchased modified and adapted many kinds of kickstands. Unless, you have loads of time, a kickstand is just not worth the effort. Pass it off to a mechanic or buy one. This is not to belittle your inquiry, it is based on my personal interest and hours in kickstands, proprietary and generic. I am analytical, not a mechanic.
Try to get a simple unit without a set screw, it is a complication.