Actually Paducah you help bring up something behind this. On a formula board when you go to do a full planing jibe its all in, feet, knees, and body. You have no choice you need a lot of energy and the board is so wide and that fin so honking deep in the water. I have a 186 formula gathering dust but loved hitting jibes at full speed.
With the foil you have a ton of leverage so the amount of force required is reduced. Especially if you ride it high. Hence why the toe pressure can get the board to change direction. Well.. that's my thoughts on this,. Hopefully be out tomorrow for more consideration. This coming week might even fin sail (has to be over 20 knots for that) so I can consider this from the other side.
Loving this journey