I have seen that people sometimes diss the 6 and 8 fin setups of tts for being slow. I wonder whether that really makes a difference, since we have mutants and directionals going really fast with bigger fins than tts.
Also, from my feeling, I would say you go faster if you edge harder (not breaking by powering over the back foot) than when you resist the kite relatively little. And since fins seem to help you edge, I could imagine they could make you go faster?
Open for discussion