I recently took a 2 day stance and alignment clinic at Stratton. All the participants had complete stance and boot analysis done. Everyone was observed on snow both before and after all the measuring and explaining was done. Then, armed with a couple bags full of shims, we all went skiing again, then the instructors fitted everyone with shims based on whatever adjustment was suggested by our measurements. We then skied with shims. We had a nice mix of folks that covered under edge, heel up, toe up and lift one side toes and heel equally. (that was me), My better turn is left leg dominant, shimmed the right side about 3mm. Results were immediately noticed.
In the group the results were unanimously positive to the adjustments suggested by measuring. a few examples
Remove heel lift found in the boot exam and not indicated by measurements and a stem to change direction went away.
Toe lifts and additional toe shims in super flexible woman made it easier to engage the ski because the ankles excessive ROM was reduced.
I don't remember if there was anyone overedged. ALL the underedged folks noticed a change in ability to engage the ski.
Then we skied as CR suggested way up thread...shim out of whack,,,,we did canting both sides and toes high. I found no real difference at slower speeds in any of these except over edged. I really didn't like not being able to get off an edge as speed increased.
So, I should have my boots shimmed? I might. I'm working on flexibility of the affected side first. I've had the issue for a few seasons and it diminishes as I get more flexible Right hip is less flexible than the left. I now know I can have the boots adjusted anytime I want but if I can fix it without I'd like to try that first.