It's easy to stay in good Rhythm (sequence) when there's nothing to actually hit. You have to get comfortable enough to be able to make the same swing when the ball is there...w/o ANY (even small) amount of "rushing the hit"...
...just a pure stroke "through" the ball...not "at" it.
Down and through low point....
Easier said than done tho right?
I think you have to have a certain freedom and comfort level in your swing.
What does Homer say? "Positive and heavy" or something like that?
I have recorded 123 mph as my best w/o a ball...but who knows where the hell that "ball" woulda went...I get around 115 when really hitting a golf ball- last time I checked.