Being up on the reef, I know that NA engines lose some 15 to 20% of their power thanks to the altitude. Do you know how much, if any, the losses would be on a Turbo engine? Something to keep in mind when you post the graphs up. I remember years ago on my trips down to Durban from Jhb and my car feeling like it had grown a turbo on the way down when I got there, lol.
I am sure with the temps you get there too, the intercooler should make a handy difference.