with the following I am now at 100% ignition/failure free with factory federal/American eagle & reloaded ammo over the last ~1000 rounds and 5 matches:
shimmed trigger & hammer, this seemingly has done more than anything else to fix the issue
cleaned up internal parts a bit more for any potential drag: plate channels, rebound slide, transfer bar (because why not at that point) and FP hole
still using factory mainspring