love my glock 43x and aiwb tulester holster. half the time i forget it's there. super easy on and off with the belt clip. 10+1 capacity is decent and i haven't tried yet but another company is making thinwall metal mags that hold like 15, still flush fitting.
I just ordered 2 of those mags, Shield Arms. Reviews look great. They do recommend switching the mag release to a metal one, because the metal mag chews away at the plastic catch of the oem release. They sell an aluminum one also. I also ordered that. 2 mags and a mag release, 104 bucks. Worth a try.
I also think the 43X is the perfect IWB carry pistol. I have a Vedder I normally use, and I also have the Tulster for when I want to carry it with the TLR6 light.
I rarely carry it with a light though. If I am out at night, I have a different option.