I use my Futura 133 with a V8 8.5 2008, which is famous for its planing power. Handles really well with the F and its standard Deboichet 48 fin, I'm just flying in light wind conditions when others are stuck, so I don't see a 0.5 m extra cause any problems.
If I were to do it all over again, I wouldn't hesitate and immediately go for a 9 m !
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