Fin size isn't something I had given a lot of thought until recently. But lately I have been doing a bit of experimenting.
This morning, for example, I was over-powered at times on my 5.2m in 23-30knots (w/ 80L evo). Didn't have quite enough time to change down to the 4.7 (would have been perfect

) so I dropped a fin size instead. Went down from a 22.5cm MFC FPT to a 21cm MFC FPT and the results were

. The board became more controllable, less bouncy and less spin-outs. The rig felt less powerful and I was immediately very comfortable, even in the gusts.