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There really is not canting system for boots. Canting is a pernament alteration of the boot sole to accomadate variations on the skeletal structure of a skiers leg bones. Most of the time it is done for racers who spend most of there time skiing at mach 10 to give them the perfect alignment....It sounds more like the boot last is too narrow or there is not enough support in your footbed. Always start with the footbed before punching out the shell. Get a bootfitter to inspect your arches to see if you need custom footbeds, if not then get a good aftermarket one. Stock footbeds are lousy in most boots, just take yours out and you will see....they have no structure to them. With proper support your foot will be less likely to go flat and fan out grinding you toes into the sides of the boot. Try this for a day or two and if you still have pain, get the side of the boot punched out. If you bought your boots from a store with a bootfitter this should all be free of charge....
It is also possible that the boot is too large, and you are compensating by overtightenning the buckles and effectively squsihing your foot. Or your foot is slamming into the side of the boot on every turn.
Do yourself a favor and quit wasting time, go see a bootfitter for some professional help... your feet will be happy and your skiing will be better