I use both cambered and non-cambered (Retros) with my Isonics. My very fastest speed was on a Isonic 101 with a Retro (37.5 knots - I got lucky, big gust, flat water)! so they do work fine, but if you're into racing you'll want an all out fully cambered race sail.
I use a weed fin (True Ames) on all my boards out of necessity - they work a lot better than you'd think (they're capable of at least 37.5 knots).
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