@Anderson: yes and yes...
Because my boot is the first supershell, the cuff rivets are just that...rivets that allow the cuff to move fwd & aft..I think version 3 started to incorporate lateral cuff adjustment..
So, after successful snow seasons using diy cuff adjustments with foam pads - read this: http://www.skibootalignment.com/page9.html
I took the plunge and got my boots properly aligned by Harald Harb - https://harbskisystems.com/
Armed with this knowledge, and after trashing my ankle in an animal boot I decided to go plastic. I originally canted my whole binding over with an under binding wedge. This worked great, but I needed to drastically raise my rear boot to get my feet at the same height...
After much help from Adam C, I am where i am now...I managed to drill out the cuff rivets and create a cam to laterally cant the cuff over...
but, like in all ski boots, that adjustment is generally not enough. So I use a small foam pad taped to the inside of the cuff on the ‘Inside’ of my leg...before I cut the cuff down and the bottom out of my liner, that foam wedge was Velcro’d to my liner - so it was always in position. Something like this:
https://www.google.co.uk/url?sa=i&url=https%3A%2F%2Fdodgeskiboots.com%2Fwant-to-get-spoiled%2F&psig=AOvVaw2MDzYU-qU5OXxhaNRbwZy4&ust=1607633643260000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCIjj0ZLkwe0CFQAAAAAdAAAAABAU
I have successfully added a wedge to several slalom skiers at all levels both plastic & hybrid boot.
The lower down you cut your cuff, the smaller the wedge that you need. The further over you can laterally move the cuff, the smaller the wedge..
You are trying to get your lower leg to be central in the cuff. With the wedge, you take up the ‘extra’ space because your leg is over to one side..this then means that when your boot is tightened up, your boot then stays flat - neutral...without it, the cuff will conform to your leg, which will then apply unequal pressure to the cuff when the boot is flat...in most cases, this will be the onside edge of the cuff...the resultant effect is a unbalanced on & offside turns...super strong onside, and weak offside....yes, you will get used to it, but you will be making adaptive and unnatural & un-instinctive movements, that will be hard to consistently reproduce...
The wedge can be any old piece of rubber/ neoprene. You will need more than you think..once you hit the money shot, it’s magic and obvious..keep testing, go larger to see what happens when you use too much..it will feel funky, prob just like you’re first sets on the plastic boot..
Side note...when you get it right, you will also start to notice that none of your previous aches and pains that plagued your ski season are there...
Ski longer, harder & with more balance.