[DOCW3]

Since the sweetspot isn't on the shaft, but in the clubface, is an on-plane right forearm in line with the shaft, or parallel to the shaft, but lying above it? Is there a substantial difference between the two?

Clear as mud??

Maybe a minor point for the intent but addressing a suggestion in your post, and thinking you will revisit the general subject, "Both Planes always pass through the Lag Pressure Point."

DRW