I Zero out #3, and use a Flat Left Wrist, Bent Right Wrist, Turned Shoulder Plane with Extensor Action. I am very pleased with the Results.
Is it Rotated as well?
Me I dont move my Shoulders much, just a little motion not any work, Im all Arms, normally these days. It took me thirty years to stop my legs from moving when I putted. I used to look down at them and think "WTF do those things think are doing?".
Now Im Zone 2 Putting. Thank you Yoda. Right Arm or Left. Not both. You could pull it back with the right , RFT and then Pull with the Left however. But you need to separate them I find.
I am in favor of zero out acc #3 as much as I feel comfortable. wether it may be inline with my left forearm or slightly off a bit. It gives me a SBST kinda feeling.
I think I been doing it subconsciously but never realized it. I am trying to be aware of it and incorp as part of my routine.