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Kovert said..
Once up to speed and allowed to run in hollow faster stuff they started to show their colours.
[...]
suddenly the speed was there
[...]
High line speed is great
Yes, that's a kind of "virtuous circle": The faster you go, the greater their advantages, so in turn you end up changing your surfing habits to seek more speed... yielding more benefits...
For your kneeboard, if you want drive even at low speed, you may like the C-Drive fins. They kind of provide the drive of keels at low speed but without the feeling of being overfinned at high speed. But they aren't as fast as the Quobba.
PS: On cutting my rear Quobbas, I realize that since the Quobba hydrodynamic advantage is mainly in the base, cutting off the "classic" tip of the fin may have made even more efficient globally...