The placement depends very much on your weight, your skill level and water conditions.
Here are some pointers:
Back Straps: The Farther back, the more leverage you will have on the fin, eg less pressure. This works if the wind is strong and the water is flat. The lighter the wind you want to move the strap father up to be able to push the board harder on the upwind
Front Straps: The farther forward you go, the more stable (less jumpy)the boards gets, but also slower.
Gunnar, could you explain it more precisely:
Back Straps: The further back the strap, less pressure on back leg.
The futher up (forward) back strap, the better upwind angle?? Is it correct?
Front Straps: The further forward front straps, the more stable (less jumpy)the boards gets, but
also slower. What about the upwind angle?
As much as I understand the further back I put both straps (back and front) the better upwind angle I should have and less speed and control upwind?
What about the footstraps position regarding the bodyweight and the wind conditions?
And what about the footstraps position regarding the downwind course?
And what about the footstraps position regarding the inside/outside position on the board?