In my opinion, as a newbie to TGM, 10-2-B is the only grip to use according to Mr. Kelly's teachings. It sounds to me as though your hand is moving during the swing causing this problem. Please post pics of your grip or go see someone who fully understands TGM. Moving the thumb to the aft side of the shaft was totally foreign to me until I started studying TGM through YODA, and now there is no other way to properly grip the golf club, again in my opinion.
Kevin
__________________
I could be wrong. I have been before, and will be again.
Master Yoda teaches a left hand grip that is perhaps a little stronger than the contemporary "neutral" and he believes that putting the left thumb behind the shaft adds support.
I have always been taught that you keep the left thumb close to your hand, connected, and the left thumb stays on top of the shaft. Whenever I tried to make my grip a little stronger, I rotated the hand, but didn't move the left thumb off the top of the grip.
When I finally understood Master Yoda's teaching, I moved the thumb "aft" and immediately felt the additional support, and my ball striking improved.
=====================
By the book:
10-2-B STRONG SINGLE ACTION V/V/A
The #3 Pressure Point and the Left Thumb are now on the Aft Side of the Clubshaft and On Plane Location for Impact support. Wristcock only – Single Action.
=====================
With apologies to whoever posted these two grip pictures originally, I would credit you if my old brain could remember... these are very helpful visuals for me.
Kevin
__________________
I could be wrong. I have been before, and will be again.