Replying to Hawx flex range

I been searching all over the inter webs and I’m convinced I’m searching for the wrong thing.

Here’s the deal. I got a pair (fitted and molded) of hawx ultra 130s and the stiffness is compatible to the Lange XT 130’s I came out of but what isn’t comparable is the XT’s would hold their shape deep into the flex without bellowing out. I feel the Hawx have like 3/4 the amount of flex range before they are unsupportive.

I guess my question is, is there a term that is searchable describing the amount of flex range before not being able to support?
-and-
As a 5’9” 210lb guy should I actually be in a race style boot to ski my invictus 89,108, Dictator 2.0 and dynastar xxl pro’s that are all 185+?


thanks.