I am looking to get out of my LF teams because they are very stiff and I am having problems with my repaired ACL.
As for the footbed, I can't see how the thickness would add to knee control. Actually i think it would get worse if too thick because of the lack of controll in the extra squish. Do they use thicker footbeds in running shoes? Also the farther your foot gets away from the board the higher the stresses imposed on the legs so thicker footbeds would cause more problems IMO.
Ask your pro shop what is the density of the foam and does that not play a bigger roal in the stability of the binding than does the thickness fo the foam?