[BerntR]

My 5 cents;

As you suggest, there must be something wrong with the plots. Especially the one on the bottom.

I think a good start would be to spread the contact points at impact the same way as the top drawing. You can do that by moving the arches of the shorter clubs straight down. Then you will get similar impact points but deeper divots for the shorter sticks. Right now the divots seem to be the same for all sticks.

Then - if you want to draw this for a good golfer, you can tilt the swing planes progressively so that you get a reasonably shallow divot for all sticks.

Then we can perhaps start think of the implications of the two lever system and the three different hinges...

This could develop into something very interesting.