Apologies, if my answer deemed negative; Rather, I visualized you standing there by the beach in no wind, watching the feather-weight young-guns riding away, then suddenly overtaking them planning on a Formula board
Given the testimony, iS150 is "nearly" a Formula, with a thinner tail and longer outline, so I'll be coming as close to a Formula - like it or not! It's gonna be tough to gybe, yet planning should be as close to them doors anyway
PS: Read the other thread