[ggm]

Reading these responses it's clear the biomechanics works for some, but also clearly doesn't work for others. How much this could be compensated for by physio or gym isn't clear, but it says to me that that the system may simply never suit some people who have higher sensitivity to the weight and momentum.

In the same sense, your dependency on corrective lenses and the nature of the problem also stand out. Some people feel fine, Some people feel fine with script matching inserts, some people can't handle internal reflections and the focus effects of a "pseudo horizon" on your focus region.

TL;DR Some people.