[BerntR]

Couple of more thoughts from here:

In the two bottom drawings you're prescribing same sweet spot height with driver and wedge. That would actually mean much deeper divots with the driver, sine the sweetspot is higher on the face.

I would like to see a third set of drawings where the lines have basically the same order & spacing through impactas in the first, topmost drawing with impact 1.5" before the ball. That would locate the sand wedge sweet spot impact lower at the ball than the driver impact, and much much much lower than the driver sweet spot at low point.

One interesting thing about ball back is that if you sole the club , the ball contact will be above the sweet spot because of shaft lean. That would translate into a "flyer" gear effect that has the ball shoot up in the air with less back spin, especially if the club has short hosel and weak shaft. With my good ol' Tommy Armor 845s irons I never could hit the ball consistently low. If I hit hard down on the ball it popped high up in the air. Now I'm beginning to understand why.