From what I have heard and read, limiting the endpoints on the throttle is not a good way to keep the motor or esc from burning up. According to Lucien Miller limiting throttle does not really limit amps to the motor and you might still end up burning up the motor or esc. You are better off going to a smaller prop. I am no expert, but if you are interested there is a discussion on the power system corner component of the ATTF podcast.

ATTF#71 at 55:00 AMP ratings of ESC/system at partial throttle?
ATTF#84 at 53:39 Can you use endpoints to control/limit full throttle?
ATTF#148 at 1:07:30 Limiting throttle end point to limit amps

Jon