All other things being equal, I would tend to agree.
They do seem to ride vey well on the tail though and keep the nose clear, although it would probably need a video of them actually pushing the board in race conditions and chop to know for sure.
They look well in control here - although these may not be the same as the Underground model, but they sure look short.
hmm, actually in super light wind, it could maybe make sense? One of the things people that have not tried a raceboard reacts to is the size of the board. If they make them shorter, it might make them more able to accept the board width. It would also be easier to turn....but not ideal in chop...