Really the Sport type does come closest to high aerodynamic efficiency..
Perhaps a teardrop blister or bimini would satisfy crewing
Still the matter of fairing the deck leading/trailing edges and adequate cuffs, and the upper surface of the deck itself

One major downside is, what happens if high winds are encountered with a faired deck?
If it is an ogival form across the deck, the not insubstantial area would provide a lot of lift, possibly getting the machine right out of the water. Ogival forms cut from a the arc of a circle have the capacity to provide lift in both directions and they always have positive angle of attack both ways.

Easy to see this geometrically, draw a perpendicular line at the 50% chord, mark the 50% height of that line, and the line to the trailing edge is zero lift.

While it is true that the longish ama will benefit in controlling the AoA, there will still be times when the AoA will persuade the machine to lift off. Possibly also true to an unfaired deck as well, as it could achieve a Cl of 1.0 ige, as we have discussed.

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