Replying to Race boots

ok so i race a lot during the weekdays for my high school. the rossignol radical pro composites fit me really well out of the box, and if i were to get them, i would get them grinded properly, stance work- the whole nine yards. MAYBE custom footbeds, probably won't need them though. anyway, the thing i'm worried about is that they have a flex of like 125 and i ski a lot of park on the weekends...so, will i get shinbang? oh and i land backseat just as much as the next guy.

my other, softer option is a lange fluid 120, but they didn't seem to fit me quite as well as the rossis. though i'm sure grinding them a little/my amazing bootfitter doing his thing would make them fine. i'm pretty sold on the rossis i just want to make sure they won't be a burden in the park.

alright thanks for the help