Well I went to see Greg Hoffman @ Green Mountain Orthotic Lab, near the big hole that used to be Lionshead, since he had done my original footbeds and boot alignment at Stratton 2 years ago.
My soles had worn so badly that he replaced the toe and heel pieces on both, then after some time with me on a board with measuring shims, got me where it felt right and ground down the bottoms of the boots.
Three days of skiing since then and it's been great. I was so badly canted that when standing "flat" you could put a finger under my big toe on my left foot.
Greg explained a lot to me that was very useful to know, it was a great education. There are different ways to set you up, as to canting, some may give an advantage, but may in the long run create problems for your feet or tendons. I trust him and his approach and recommend him highly.
Interesting thing is that in a way he did confirm my comments in another thread that if you're setup wrong you WILL adjust to it (as I had.) It's just better to be setup right