We want to play with the flex on my wife's World Cups. There are two bolts on the spine. Does it matter which one you remove to make the boot less stiff?
What size boot?
height and weight?
can she flex the boot (standing on one foot) when not on skis?
if you take out the top bolt ---- about 5% softer
If you take out both bolts the boot should be about 10 to 15% softer
but it will loose the rebound it has when the bolts are in, (rebound is a good thing)
If she can flex the boots on one foot, I would wonder why she can't flex them under G loads out on the hill. could be a fore/aft, off center position problem.
Does she get tired quads?
do her toes get crammed?
i guess that was typed from a phone and you need to flatten the tongue!
if you flare the cuff back then she can stand more central and use the ROM to flex the boot rather than be hanging in the front of it and not have any motion left to flex
Read through the above article and pics to see how to flair a boot, some shops are set up to do this.