I've been reading TGM forums since 2003.
I know I've read "the flat left wrist must stay vertical or perpendicular to the plane as the right forearm traces the plane line" at least 100 times.
It finally clicked yesterday after 2 lousy range sessions!
Amazingly,

extensor action is much more significant (you feel it more) when you make sure of this simple but oh so important fundamental. Also, the turn feels so much tighter.
I now know that during the last 2 range sessions I was "switting"
