That is counter-intuitive. It's not as high as it appears, probably close to the normal ramp angle of most waterski bindings. The carbon in the heel of the skate boot is maybe 3mm thick and there's a big posting block under the metatarsals.
I used to do stuff like this, working for my brother making custom skate and bike shoes. I tried double skate boot hardshells (scared the livin' heck out of me); used to add tons of plastic to bindings, etc. T-Whisper solved all binding problems when he created the T-factor (.)