As I mentioned in another thread, I asked Jackson whether the outsole shape was changed (my question was specific to Jackson Freestyles, which is not what the o.p. is concerned with!) when you ask them for a lower custom heel height. They responded in email. They didn't give me an explicit answer - but said they only made one heel shape, which I took to mean the answer was no. I was a bit surprised by that - since they were willing to remove up to 9/8" from the 2" heel. And it is the amount of curvature at least as much as the tilt that is uncomfortable for me. Perhaps because I have never worn any high heel shoes other than skates - in fact, I sometimes prefer "reverse heel" shoes, in which the heels are lower than the toes. So my feet never attained the degree of bend flexibility that high heel skates force.
Someone at my favorite rink showed me their (
custom) SP Teri boots, which had a nearly flat footbed. But I don't know that a person who is very happy with the fit of (old) Jacksons, such as the o.p., would be equally happy with SP Teris. Plus, they WERE customs, and may therefore be atypical of SP Teris. Maybe someone here more knowledgeable could say.
I am currently out of town, in a place with no affordable ice rink, and have had to put a hold on my experiments with heel height.
So if the o.p. were to conduct such experiments, I would be very interested in the results.