I don't know what it was but a couple of years ago I played absolutely fantastic for about 2 weeks after doing the Tour Tempo stuff. Then I believe I got flippy again and started trying to swing "quick" instead of "fast" and started swinging "my hands with my hands" instead of letting my pivot do the work. IMO there is a fine line there.
I may look into it again, now that I have a clue about what and how things are supposed to move in the swing.