Aerodynamics in this case is good up to the point of avoiding a positive lifting issue but I think you'll find that the surfaces and their effects are very small compared to the kicking about that occurs due to the roughness of the water. And AFAIK there's seldom an issue when it's glass smooth. Not so?

Where you could gain is to provide for a slight downforce that could be dialed in for rougher conditions to aid in preventing the hydro being kicked up by ramping off a bit of chop and then "catching" the air and causing a flip. But I would think that the only lift up that you want is the actual spots that are touching the water. Otherwise disaster is only a blink away.

If you're looking at actually flying millimeters above the water rather than hydroplaning in contact then you're looking for WIG or Wing In Ground effect. That's a WHOLE other issue and has nothing whatsoever to do with classic or even the picklefork outrigger hydros that are commonly used in boat racing. A WIG craft is an actuall airplane that is optimised to operate at it's best very close to the surface but is capable of flying upwards for popups and for turning when needed. They have a boat hull and wing tip sponsons but that's only for takeoffs and landings and while operating they are airborne. THey require all the typical and proper aircraft controls and aircraft balance point.

But for racing I doubt if a WIG would be considered legal since technically it's not a boat. It also uses aircraft engines and not a water prop.

Do a Google on the words "wing ground effect" and it'll come back with a lot of reading for ya.