My 2 cents to answer #10...I have come to this conclusion after giving thousands of lessons over the years, and seeing hundreds of thousands of swings...the reason the practice swing is always better than when a ball is there, is because WITHOUT A BALL AND TARGET, THE PLAYER MAKES A CIRCULAR MOTION ON AN INCLINED PLANE VERY EASILY. ONCE THE BALL AND TARGET ARE INTRODUCED, THE PLAYER WANTS TO PUT THAT CLUBHEAD ON THAT BALL-TARGET LINE, AND THE CIRCLE SHAPE THEY ARE WANTING TO MAKE IS DESTROYED. It's the mistaken effort to put the clubhead tracking on the target line that ruins all chances of replicating the practice swing.
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