I am curious why the bobbing of the head on the downswing is a big deal to playing high level exceptional golf. Watching most of the great players of all time on the down swing their head lowers as the body seems to compress into the ground. Tiger and Hogan did it considerably. You wont find many that dont drop it down to some degrees in the downswing.
backswing I agree that you want no bobbing.
It could be that transitioning to the Elbow Plane from the Top of their Swings needs a very strong Downward Thrust, then Outward. Downward then Outward in a sequenced kind of way. Whereas, while Swinging on the TSP we need a Force (Right Shoulder) that's Downward on Plane; Down and Out Simultaneously.
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