I decided to return to skiing last summer. Being of firm belief that shoes are medical appliances, I went to several boot fitters. None of which could answer my question.
I wonder if lower leg length is a factor in flexing a boot as much as weight is. I am 6-1, 175, but fully half my height is in my legs, which is different from a large majority of the population. The question came to mind when one boot fitter commented on how much I could flex the boot that I was trying on (Dalbello Panterra 120).
BTW, I can flex my ankles until the knee is over one inch in front of my toes without lifting my heel.
The ball is in your court boys,