COnsultant, with all due respect, please accept that I respect yor knowledge and experience. But, he'd be better served moving the barrel into the right position and tilting/turning the shoulders as the rear arm slots to get the barrel into into a slight upswing.
That swing in the drawing is one of those "looks nice" in the picture, but it ain't how they swing.
The point of impact is going to give it the back spin. That being said, I can give it back spin by swinging down...but it's not going to carry all that far.
I'd rather make contact in the right spot..with the right swing plane.