STH47541 Smooth Cast 320 Fast Setting Urethane Liquid P - bidStart (item 23723811 in Toys & Hobbies... Tools, Supplies & Engines)
I've often thought of using some of this in a simpe wedge mold to make a flexable plate to cant the whole binding. You could even use a harder urethane in the middle for better heel/toe response.
2011 Smokin Buck Ferton 155
2013 Flow NX2-SE
2013 Flow Hylite boa
Burton Stagger pants/jacket