I am glad the Kahr PM9 is working out well for you. That's the most important thing, that you feel good & comfortable & confident with the handgun you use for conceal/carry.
TTY
That is perfectly normal for a firearm. If you know anything about machining or mechanical engineering, the fact is that any moving assembly has to wear together. That is why when rebuilding an engine you put all the parts being reused back where they came from. No matter how good the machining tolerances, that wearing will happen and the gun will be more reliable afterwards. Every manufacturer has to decide where to come down on accuracy vs reliability and there is a lot to be gained in accuracy by building a gun that might have problems in the first few magazines.
A gun that functions perfectly out of the box is a combination of a good design and a bit of luck.
I know what you mean about comfort. The Kahr is nowhere near my Kimber in comfort and shootability, but I wouldn't expect it to be. I bought the Kimber to shoot as much as possible, the Kahr to shoot no more than necessary.