Replying to Boot or foot problem?

I've been enjoying skiing in the French Alps for the last four weeks in relatively new Full Tilts.  The first week involved afew trips to the bootfitter for lining heat-moulding aswell as some shell blowing. All was well on the groomers and in the park, but when the snow came and embarked on the powder, I felt really sharp pains up the outside of my lower leg whilst skiing. It wasn't the calf that hurt, but more like an aching in the muscle runnning beside itbewteen the calf and the shin,  down and into my boot on the outside of the leg. I altered the canting of the boots but I don't think it has helped the situation very much. Any suggestions? Is this a problem with my technique or a problem with my foot in the boot?
Thanks for any help.