I run in the advanced group and threshold brake for short periods of time. I have done 3 events in the past month with a 4th this weekend. The first two were stock with new fluid and Hawk DTC 70/60 pads. I experienced fade at the end of all most each 25-30 min session.
I removed my dust shields this past weekend when I was at Hallett. I still got brake fade at the end of a hard 25 min session. Granted, I did not have brake ducts running straight to the hubs, but with no dust shields, you would think I would be seeing some improvement.