Yeah, that is why i needed the external cutoff. I ran on Sunday with the cutoff turned off on the esc. For a 6-8 minute race, it stayed well within the safe voltage range.
Just re-read the manual for the LCD programming card which does offer one more option than the card that comes with the esc. It says that it will do a custom cutoff in .1 volt increments, but it looks like it would only go down to 3.5 volts. Wouldn't do a lot of good.