[cometgolfer]

Except with Zero #3 Accumulator, the stretch (Non-Accelerating Thrust) of Extensor Action -- whether executed by Pressure Point #3 or #1 or both -- is not On Plane, i.e., toward the Impact Plane Line. Instead, it is Below Plane -- in the direction the Left Arm is pointing.

Could the incorrect directional application of extensor action (i.e. directing it toward the plane line rather than below plane) cause the club to get too flat from start down into release? Although I'm able to go from start up to top staying nicely on plane, I've always fought a tendency to have the club move under-plane from start down to release (a Sergio like motion). I just grabbed a club trying to feel proper extensor action, and I can see that my natural tendency is to direct that stretching direction toward the plane line.

CG