Looks like the "only" adjustment is at the sear and the weight of the trigger pull.
FYI, this action had a T&T job done and has a lighter firing pin spring. I'am thinking this may be the problem.
(the action "is" out of the stock as I was in the process of changing bolt head and barrel to 17 VHA)
Not sure why it's acting up now but, "things" happen.
I think I'll go after the firing pin spring tension and see what I come up with.