In regard to Tigers slightly less centered motion remember that they are hitting different shots. Tiger hitting driver, can be said to employing a special procedure. Allowing his center to hang back a touch for launch angle or angle of attack purposes. Great comparison though.
oh ya,, hitting up with the driver is the new thing.
If your clubhead travel from higher on the ball at impact to lower on the ball at separation, did hanging back with your head help you to hit up?
I heard that he switched to a 10 degree driver on Sunday. Hmm? I haven't seen video nor checked for head location.