The biggest problem I see with kite surfers breaking records is just as I say. Find a tropical storm, hang 15 sq. mtr kite in the air and find a jackass type of guy to hook himself on to that. Afterall there are also no rules requiring the pilot to survive the attempt for the record to be valid ! Get my point ?
Another approach would be to wait for the wind, wear a wing-cloth (wearable rigid wing), tie the feet to a ski and go for it. The aerodynamic drag of the crew body is nearly eliminated and the power can be the same as in a windsurfer or kite.
