its ok i also have a 54cm and 59 cm tabou manta for the smaller sails.
the 5.5 was chosen for speed alone.
at the moment i'm about 77kgs and 178cm.
I ran the JP 112L with a 36cm weedie with the old rss 6.7 but i'm not sure if i was under or over finned.
Damm all this talk of fins and sails IS going to keep me awake at night