Jeff,
As I remember doing it some months ago, I think the two options you describe are both valid:
The first one being used on full shots and the other one (the gentle right shoulder thrust) for pitches and chips.
The feel and action stay the same (I remember it very clearly!) and you just are just varying the lag pressure in PP4 (0% (small chips - no pivot) to 100% (a 350 yards drive! )) to accomodate for the shot at hand.
But it is still an action of the pivot THEN the action of the right arm WHEN you feel ACC#4 starting to release.
Yodeli
Your description fits my previous understanding of hitting. However, after watching the LB hitting/swinging video in his video gallery, I am now led to understand that there is no pivot action (right shoulder downplane thrust) - neither gentle or assertive - in a hitters action.