I shot my P10C in Production in a few matches, then later in Carry Optics after I added the RMR. It?s primarily an EDC gun for me, but I like to shoot my EDC guns through a few matches to wring them out however was having so much fun with it that I shot it for about 6 months in Carry Optics.
I did similar mods to mine: CGW SS guiderod, CGW striker and anti-clocking pin, HBi trigger, and Dawson sights. All legal mods for Production division. Then I had it milled for the optic, so now it?s a CO gun in addition to being my EDC.
As far as recoil springs, I ran some drills using a 15 and the 18 lb spring. Prior to the addition of the RMR I was running a 15 lb spring. Post RMR I went to an 18. This is with 130-132 PF reloads. Try shooting Bill Drills with same ammo and both springs. Go with the spring weight that gives you the best grouping at rapid fire (all A-zone in ~2 seconds @ 7 yds). Outside of competition I put the stock guiderod and spring back in for use with social ammo.
Good luck!