Well, let's just say that changing one thing at a time will narrow it down sooner than changing everything. Current factory rating for the G23 should be 18lbs...previous models did 17lbs.......not much difference really, but anything above and below should be considered extra power or reduced power accordingly. Might I ask if you are running a captive or non-captive rod? Round spring, or flat wire? I've been tossing the idea around myself for competition, but I only use factory ammo. Grip/hold that Glock just like you would with full power loads IMO.