Talk to AJPTurbo.
He's been doing the remote tuning on my car and I've sent him logs from a ton of different elevations ranging from 4500 to 8200 actual. One thing we noticed quickly is how fast the waste gates are sent to a higher % and on top of that the shitty 91 octane really blows for the spark table.
Bottom line, with these little turbo's and our shitty mountain air/fuel don't expect to run the same times as the others at much lower elevations. Your meth will help quite a bit though. On my racecar when I ran meth it went from 500rwhp to 570rwhp.
Also Brad has my tune totally safe at all elevations. I've ran the car in Cali along PCH with no problems at all.