I'll make a comment--when I look at that motor in DriveCalc, someone has entered some measured rpms/voltages/amps, and DriveCalc calculates a kV of ~700 rpm/Volt. I can't vouch that John's is the same, but it might be worthwhile to make a kV measurement.
To do that, take the ICE out of governor mode and set the timer throttle to 100%. Remove the prop and start it up. Look at the data, and kV is basically just the rpm/volts of any time slice in the plot.