[O.B.Left]

If as you say, you are pushing down with the #1pp on your left thumb to uncock the left wrist...............what grip type do you have? 10-2-D? or 10-2-A maybe.

Maybe Im taking your words too literally, maybe you are talking about Driving the #1 pp in a classic Hitters, overlapping Release sense.

To define what it is you are doing you'll need to figure this out. Does your Left Hand rotate off the Inclined Plane as a result of this pushing down with #1pp? Classic Hitters Drive Out with a Right Arm Throw. Or does your Left Hand stay turned to the Inclined Plane ....?

You know that vertical hinge pin arrangement you were talking about in the left hand? Are you pushing on the top of the club shaft or the side of the hinge ? Are you driving the club only or the entire Primary Lever, left arm and club together? My guess is the latter.