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jn1 said..^^ I think it depends on the rider, their style, and the board. For me, deep bear aways over homicidal chop like we get at Boggy lake can cause fins to stall. I find using a little bit bigger fin can almost eliminate that. There's a few big speed riders I know who dabble with wave/FSW boards occasionally when it gets mental. They need that bigger fin just because of their style of riding a board.
Nice video Reid

4.2 sail with 31
freewave fin is really out of wack. I have similar RRD boards for the last 14 years, 85L and 90L and the biggest fin I put on the 90 FSW is a 30, K4 Fang or Tectonics Falcon, with a 6.0! My RRD is 2019, 60 wide, same width of the RRD 95 2008 (that came with a 29 fin).
The video is nice, but I really doubt that instant reading of 30 knots. Really, I never crossed much more than 28-29 knots with my RRD, very overpowered with a 6.0 Point-7 ACX. The rails of the board eventually catch, as you see in Reid's video right when the gopro thinks it is going 34mph (and of course the second you catch the board slows).
Maybe be it is me, but Reid ... get a GPS device! It is fun to push a FSW to its speed limit, but the gopro is probably just showing spike artifacts.