And I'm with the Maury! Frankly, there's nothing you can do to correct your trigger problem without replacing parts. I'd talk to the CMP, see what they say, but that trigger needs more "help" than just some abrasive. BTW, to identify your "problem part", Maury's parts-swapping gig is an EXCELLENT idea!.
Oh yeah.....your failure is the "other" mode of sear-capture failure, and I was remiss in not including it....chalk it up to not much sleep in the previous 72 hours with my apologies.