Good point. At the very least, one could hope that the testers commented on the fin difference as possible explanations and preferable also did a few test runs with different fins.
When I test my boards, I always try them with a big variety in fin sizes and styles since this is really the only way get a feel for the performance spectrum of the board.
In defense of the board tests, testing both in different conditions, with different fins and sails results in a combinatorial explosion of different options, ie not always practically possible to do.
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