I never realized you were that far up. DOH!
A rule of thumb for the main is 1 size per 1000 feet gained in elevation. You ever look up the stock high altitude jetting for the bike? I cannot seem to find it anywhere online.
I'd start at the pilot by one size down. Tune that circuit. Then on to the needle/needle jet. And then on to the main. Until the bike runs well.
Man I missed the most elemental part of the equation. My humble apologies.
If you're going to be crazy,you have to get paid for it or you'll get locked up.
Hunter S. Thompson