OK, thanks for answering me...
It's been my experience that cleaning solvents sometimes get brushed into the hand window in the recoil shield while the gun is being held with the barrel pointed upward. This tends to build up a layer of congealed oils and fouling in the window behind the recoil shield. As this layer builds up and dries, it will hold the portion of the hand that rides in that slot back. Basically, it is riding on a layer of congealed and hardened fouling. It cause the hands beak to release early. Simply breaking the gun down and scrubbing this area with a non-chlorinated brake spay cleaner....generally returns the gun to normal timing....saving a good deal of gunsmithing bill and replacement of parts plus fitment....
To answer your other question, I tend to hone the riding surface(s) of the hand if I need more forward or less lateral engagement. I've never needed to file a frame
giz