As with many other questions I've posed to medical professionals, I did not get a "good" answer. My suspicion is that their measurement techniques are not as precise as we would all like to believe.
I had been experimenting with various thicknesses of wood shims (flat, not tapered) placed between the floor and the sole of my foot when lifting to try to get dialed. Anything more than 10mm did seem excessive and awkward. And I had lifted my ski boot 10mm a few months ago and it felt great. So I convinced myself that 10mm was the right answer.