so many different opinions out there.
not many guys ride single fin shortboards.
cnj beachbreak decent-quality waves.size,base,rake,flex.
6'9"x 21"x 2 7/8" double-wing swallow 6-channel bottom.
wilderness 7.6".rsc rusty 7.5". greenough 4a or 4c 7",8".

i heard kidman,machado,etc. use 9" fins on 5'10" 's.
please advise.