Interesting that we've had similar discussions about waterski bindings. Most waterskiers ski best with a medium height up the shin. Too low and there's no control. Too high and things get twitchy. (I've tested both.)
@Slim might need better fit of the top of the boot. I add foam shims to get my waterski boots to fit properly around my skinny ankles and calves. I Also do this to my snow ski boots as they pack out. And I've had to drill tighter holes for the upper clips on some snow ski boots to get a good enough fit.
I got a boot top fracture from my really old short stiff Nordica red racers. Now I like a tall soft boot (and anything but Nordica).
Eric