Maybe look into the new GCat 5M Mk3. Or an older G-Cat 5M Mk2 and add another headsail on a pole. Any way you swing it, a GCat will hold a tremendous amount of weight. I've had over a 1000lbs on my 5.7M and didn't even put the hull-stripes under and it still sailed decently well (later with only 1 other crew on board (~300lbs combined weight) we were nicely double-trapped).

You could probably even handle a GCat 5.7M. I normally single-hand mine up to 15knots and I'm only 150lbs. Granted, over 10knots I consider going uni.