[Yoda]

Yoda,
Regarding "finish swivel"...

I use club-face counter-rotation, with layback occurring through and past impact. IMHO this is one of the reasons I am getting the lazer chip-like accuracy. The feeling is very much trail shoulder "under", with my trail wrist actually slightly supinated at the "arms straight" post impact position - counter rotation. This would not seem to lend itself to a swivel (as in 4-D-0) as I understand the motion. Perhaps this is why I am not able to amp it up a notch - or perhaps I just need some fog cleared. Should I dump the counter-rotation?

The TGM term for your "counter-rotation" is Vertical Hinging. Its Clubface Layback does promote accuracy, but at the expense of distance (as you have discovered). In essence, it is controlled Steering (3-F-7-A).

When you have reached the end of the Follow-Through and desire a longer Finish, it is important to Finish Swivel. This is true regardless of the Hinge Action employed. Check out my free video Yoda of Arabia in The Gallery and see how it's done. In this clip, I demonstrate from a target-view how the proper Swivel after a Vertical Hinge Action is accomplished. While this demonstration is done in the Sand, the principle holds true for the longer Shots from turf that you have described.