Jerry

This isn't a free board issue with our boats, although I grant you it may be down to the shape of our hulls, we found that the water was riding up the outside of the hulls, we have pronounced shoulders in the beam tray area, it was these shoulders that the water was interfering with, canting the hulls didnt raise the free board on this side of the hull, it just stopped the water flowing up the hull.

As to other effects, I think you need to bear in mind that a catamaran hull spends hardly any time with less than 4 degrees of lean in any conditions, so they are very rarely travelling on a level keel through the water.

I think this is one of those areas where there are so many variables that it is very dificult to theorise what is best, the only way to tell is to try it, then try some other angles and see what works best in a variety of conditions for the hulls in question.

As to why it costs more, you either need 2 different moulds to produce the hulls or you need an extra step when fitting out the boat.