Can you explain how any of the Apex parts are causing light strikes?
Striker is fully cocked, it gets released, what's robbing the striker of force?
Sear tipping too much so the striker rubs on the sear half that's in front of the pivot point? With slide off, does pulling the trigger bring the horizontal surface of the sear past 180 degrees (tilting sear further than necessary)? That's my guess, being a forward set sear and all, must mean increased overtravel = more/too much sear movement. Maybe a loop adjustment is all you need. Maybe firing pin block rubbing as well.
I'm not an experienced pistolsmith, please share your experienced thoughts.