I’m imagining something like an intuition liner would have thicker foam and do a better job of heal retention, as well as rendering shims redundant. Step 8 was written as a size 24 liner, a more complete description is a size 24 Palau liner (which seems rather like a French intuition but I know nothing else about it).
Depends on which Intuition. I have a pair of medium-volume Pro Tours that I can't use because while they do take up the space I needed them to, they are too bulky in the heel and push me up in the boot to where I feel like I'm in high heels when skiing. It's horrible. But I have used lower-volume Intuitions in the past to great effect.