Tuning for MBT

That all seems normal to run through slowly advancing the timing to find the MBT for Low to mid Rpm but is there another way to find MBT for right up high in the rev range? It just seems a long time to have the engine sit at say 8000rpm while you do this?

wot tuning. increase the wot columns by 1 or 2 degrees until you see that the torque is not increasing anymore. the back down 1 degree just to keep a safe marging.