The smaller fins help with tracking and allow you to customize the feel of your board, like Edward said. I've found that without the center fin, I can get away with bigger mistakes on landings because the board doesnt try to pull me around as much. But, on the other hand, with the center fin in I don't slip out as much on landing, which helps if I don't really feel like hanging on to the rope for dear life if I mess something up.
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