It depends a bit on the place you will use the boards......
On open water/ slalomcompetition/ serious chop you might be better of with a tectonics falcon f1/ tectonics talon design.
Normal crosswind matchracing, or a bit downwind speed a bit more powerfull design would suit better. Under my iSonic 86 I like to use a rather soft but yet powerfull fin (sonntag SL-S 32cm).
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2011 Starboard iSonic woodcarbon 107, iSonic speed special W54, iSonic speed special W44
Severne Reflex Sails