I would reccommend a jetting size for you, but I can't to be honest. I've only ever ridden at sea level, but the other guys on here can get you near perfect (they are pretty good.)
Did it overheat, or comletely boil over?
Do you know how to check your jetting sizes?
-Check the radiator cap to make sure it's functional.
-Check your stock water impeller(it's plastic, could've melted.)
-Check for any leaks, loose hoses, etc.
-Take your radiator off (if dirty), and spray it from the back with compressed air.
-Flush all the coolant, and replace it with Engine Ice.
-Check the motor for internal damage.
I boiled my bike over pretty bad once from working it to hard on a humid night at the drag strip, and it took me a while to shake the problem.