in transitions volume makes difference, as well as area, and where the area and volume is
in particular on the low end, and even on the very high end - also in surf depending on the wave and how fast you ride the wave
on the low end, when you gybe or tack you drop off a plane and then the volume is important
and when you are really powered and want to gybe, too much volume can keep you from settiing the rail and you can bounce out of a turn
on waves you often slow down which is why the thicker surfboard versus a thin board of the same area is generally preferred
the recommendation i have seen, i think it was real kiteboarding on the evo
use the firewire guide for sizing for normal use but if you ride more powered up, go down a size, if you are pushing the low end, go up in size
https://www.realwatersports.com/product ... ire-fst-53
also since the modern planing hull shapes are cutoff in nose and tail, and straighter edges, it is hard to compare with a conventional surfboard based on length and width as far as the range of the board
the volume is a better comparison, in my opinion