To the OP's question about making the holster "stickier" in the pocket. I'd suggest getting some of the rubber, non-slip, "woven" drawer/shelf liner material like this:
https://www.amazon.com/Gorilla-Grip-...r+shelf+liners
...cutting it to shape of the holster, and adhering it to the holster using contact cement. This is the basic approach used by this, generally well regarded pocket holster maker:
https://mikaspocketholsters.com/product/pocket-holster/
Good luck.