[brownman]

Splitting hairs a bit are,nt we guys,we are never ever going to hit the ball to this degree of accuracy time after time,not even Tiger cant,the best guide here is where the ball ends up,and how it got there.Hogan said,golf is a game of good misses.
The time would be better spent practising routine,alignments and compression than worrying about hairsplitting details of exactly when the ball leaves clubface etc,Iron Bryon is a good example of what Im talking about,even when the machine hits in repetition,the balls dont land on top of each other nor do they travel exactky the same distance(all just good misses).IMO,go out and feel the shot and enjoy the hit......Cheers