4-barrel or 3-barrel?

[Yoda]

What I feel is that I my right hand (PP#1 or PP#3) supports the primary lever through impact. I do not feel I am deliberately applying muscle power, even though I the supporting force is there - somehow.

What can I do to determine whether the "force supporting the primary lever through impact" comes from clubhead lag pressure (PP3 transfer power) or from muscle power (PP1)?

There is some kind of supporting force there - and it is VERY productive.

I'll put it this way:
What - if anything - supports the shaft through impact for a Swinger?

Have you referenced 10-19-C (Drag Loading)?

"Then, further acceleration can be applied only at Presure Point #1 to support the Pull on the Clubshaft -- especially for Short Shot Power."