Replying to First Chair 10/12 stiffness

Can anyone with actual first hand experience with the First Chair 10's (or with the 12 tongue) tell me if they're stiff enough for skiing hard in the deepest of pow days. I've got 110flex Nordica's and I'm longggg due and upgrade- my skiing has advanced massively since buying those and I hate the feeling of flexing forward so hard I feel like I'm going to pop out of my bindings when I land super deep into the snow.

I'm planning on upgrading to the 130 flex Promachines which are sweet looking boots but I've had my eye on the first chair 10s for years now.

Basically, has anyone got the First Chair 10s and ever thought, 'damn I wish these were a bit stiffer'??
cause if anyone has, then I'll probably just get the promachines.