When I EDC'ed the Shield IWB, it was a crazy lint magnet, and I did what you do. When I switched IWB EDC to the all metal CZ PCR, the lint problems stopped.

My husband and I both EDC'ed the same guns in the same holsters, and had the same lint issue with the plastic gun that stopped with the metal gun.

I think there is a static electricity thing going on.

I shoot the PCR regularly, so I stopped the lint check. Still unload my carry ammo, P9HST2, to wipe off the oxidation on the copper HP.