I think you would be pleased with the Mudd Ox with the 26x14x12 Vengeance tires. They have a lot of floatation and even with a large load, and multiple passengers, the Ox floats much higher than pretty much any other machine I have seen.

Also keep in mind, that the small engine manufacturers rerated the hp of their machines downwards a couple years back. Most are now rated 3-4 hp less than in 2015, so what is now a 23hp would have been rated 27hp then.