When traveling, I pocket carry a 642 in a nemesis pocket holster. It's open ended though but I've never seen any buildup whatsoever from lint or other small debris in my pocket.
I also have the LG-405s on mine and although the recoil is already very manageable, I'm sure you'll benefit more with the little recoil cushion it has when you shoot .357 through yours.
I dry fired mine a lot and got a nice clean trigger now. I haven't gone to the extent of changing the springs because I prefer a heavier trigger on this firearm.
Congrats!
Odyssey