See my Road Setup settings for everything else. I only put in the changes I made for the Test Course. Since I don't do qualifying laps to get myself out of last place, I had to do a bit of drafting to get myself into first for this race every time, but The only time you should go under 240 mph is when you pit, even if you ride the inside of the really large corners like I do.
On Pro Level GT All-Stars, I pulled 4 consecutive laps all within 0.1 sec of each other. That was nice.