A while ago I had discussed planing hulls with some A-cat designer and he replied that they had tried during the 80's to make it work, but failed to beat the normal hull designs. One issue was to keep the hull planing smoothly. Typically the boat would drop off the plane when heeling or pitching due to a gust. This could well be one of the more important reasons why powerboats are all planing designs were sailing cats aren't. It is easy to keep a powerboat "flat" or tilted at an optimal angle.

Wouter [/quote]

I have certainly experienced this affect. I have presumed it was because I have cut the rig down to almost a masthead and I was overreacting to hull lift. It has helped to make much smaller adjustments in mainsheet. But when it does drop it feels like time has stopped.
Ideally I am trying to keep both hulls in the water and this is a learning curve also as I only want outright speed and am spending no time on general performance. The boat is so far much easier to keep on an even keel than say my Hydra which has less sail area and is heavier.