Have you tried swapping triggers? Before you do that, try the 'tapping' again while holding some forward pressure on the trigger lever.None that I can see. I have the same trigger in my Mausingfield. No/very little cock on close there either.
Bix Tac Sport Pro X in both actions.
No problem with the regular competition triggers or just the Tac Sport.
Seems like the sharp impact of the hammer is josling some bits inside the trigger.