[dlam]

I have used them all incorrectly

PP4 .....I prefer to feel a tighten at the armpit with external rotation of the left humerus. If I just let it fall Im not using the pect major or the rotator cuff muscles particularly the supra and infraspinatus muscles. IMO this is what give a positive torque to the shaft and the full HH.

PP2......I have broken both my 4th and 5th metatarsal bones, so when my last three fingers hurt, I know I'm doing something wrong.
The left hand doesn't work as a whole unit like putting.
I get into trouble when my left thumb moves to the top of the grip and I zero out acc #3 and SWING. I wont be able to use PP2 to full potential and the back of my left hand hurts.
I believe in a stronger left hand grip to max PP2. Firm pressure on the last three fingers only. I found that the better utilization of PP2 cause blisters over base of the fingers.

PP3...and PP1.....well that would be another post.