The trick to this is gearing that tops out at the optimum speed so that you don't have to worry too much about throttle control once you're on the water, you can just pin it. Try it on a big puddle to start with.
By the way, the formula for barefoot skiing assumes an average sized pair of feet in contact with the surface of the water. The surface area of your tires combined does not even come close to that of a pair of adult feet, so I would change the +10 modifier in the formula to at least +25 and start experimenting from there. Maybe I'm overkill.