The Wave has already used as much of the mast as possible. It has a square head mainsail already. Unless you added a deck-sweeper (which would give you only a marginal advantage.., and make it difficult to tack) it is using all the area it can.
Agreed, it is still under powered. That is why I went to the Hooter.
Am presently working on a larger Hooter (furling) and a self-tacking jib (also furling)
Should have more on it by fall.
Rick