Here's a case when more is better. The twin Suzuki 140s pushed the 246DC perfectly well through the 4- and 5-foot seas outside Miami's Government Cut. However, top-end in calm water resulted in an upwind/downwind average speed of 39 mph. The 140s sported relatively small 13-inch props. If you mount Suzuki's muscle-bound 150s with 15-inch wheels, that extra 10 horsepower would boost your top-end to about 53 mph and, at the same time, probably offer better fuel economy at mid-range since the engines won't have to work as hard.
Normally, I don't suggest anyone sit down forward of the helm underway except in flat water since the ride gets bumpier closer to the bow. However, the World Cat's ride in a chop proved so smooth that even our passengers in the pointy end thoroughly enjoyed themselves.
Initially, the 246 banked slightly into a turn at speed, then flattened out, scribing a wide arc until you turned hard enough to drop the inside bow. Then speed bleeds off quickly and the cat turns sharply, but without dangerous centrifugal force. Since the Suzuki doesn't offer counter-rotation in the 140-hp model, the cat turned more readily to the right than the left. Likewise, close-quarters handling and spinning on a fish would improve with engines turning opposite directions. An informed source says Suzuki may have an equivalent horsepower four-stroke next model year available with counter-rotation.
One thing I love about catamarans; no bow rise coming up onto plane. Put the throttles to the wall and a cat leaps forward.