I want to make a fish with hardly any rocker. But the u.s. blanks all have to much rocker built in with not enough foam to shave the rocker out. My fishcuit is my favorite board and it hardly has any rocker. I don't know the other exact details i want to change but i know i want to keep the rocker similiar or even less for that gliding/planing over weak sections.

My question is should i get a 7'9 or bigger blank and cut it down to 5'8?
How is this usually done?