If your heel is against the shell and the back of your calf is against the cuff and the whole thing is buckled up, how can changing the ramp angle of the boot board put you forward or in the back seat? The angle that your lower leg is held at by the shell and cuff remains unchanged by the ramp angle. Maybe an insignificant change caused by a slight slendering of the calf muscle from being raised a couple of mm but hardly anything. More or less ramp angle only affects the ankle's range of motion or "locked angle" (sorry I invented that term) if the boots are really stiff. Please explain how lifting the heel (or lowering the toe) inside the boot by a couple of mm will move the CM appreciably because I'm calling BS on it. The angle of the lower leg will be decided by the forward lean of the buckled up boot not by opening or closing the angle of the ankle a couple of degrees within it. Changing boot Delta Angle is a different story but that's done from the outside of the shell.
Boot Board Ramp Angle Changing CM... WTF???
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As a Pedorthist we are trained, during our schooling. that heel height has an effect on balance. if you raise a persons heels by what ever degree he will notice a movement of load toward the front of the foot---if you lower the heels he will notice the opposite---I can't see where being inside a pair of ski boots would change the effect.
We have developed a balance board which measures load on the front and rear of the foot and with a 3/4 inch heel lift the average person will notice a more balanced loading of the foot, and by adding a sub talor neutral foot bed we could achieve equal balance fore/aft.
A woman wearing high heels will have most of her body weight on the met heads (fore foot) as she walks and conversely if you have ever worn "Earth Shoes with a negative heel you would have noticed that the fore foot is unloaded by the angle created by this type of shoe.
So. lowering the boot board angle will move load toward the heel and change the fore/aft balance of the skier, Adding a heel lift will do the opposite.