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I know Infinity has board model called the Cluster that is a similar concept.
http://www.infinitysurf.com/inf_longmodels.htm
I thought about using 2 Future fin sides (5 1/8”) with a 4” center from True Ames.
This would not be on a swallow tail but a 14 3/8” squash.
I think this could really loosen up your ride where the surf might be mushy and want more flotation than a fish.
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Any experience in this area is welcome good, bad, and ugly.
Cheers
-Tony