If you plan on running the SC in the leagues there's an issue being investigated http://forums.codemasters.com/discussion/46897/sc-spa#latest.
No idea if this is an issue post patch or was always an issue
I only did it twice, both times at Suzuka and under the SC the 1st time whilst talking to my Mrs
At the time it sounded very arrogant, but at least it was better than Pete moaning his car didn't turn with q 1-1 wing at every track lol
Have codemasters posted the differences between the damage settings?
We started our championship with Simulation but as the AI are nutters we went to Full due to the amount of times we got killed, I've now changed it to Reduced which I'd expect to see less damage and it doesn't appear at 1dt...