It seems from the testing I've done that the car or track change a little each time you log in. It's also better in warm up, than it is in the race.
That aside, my car steers well and will haze the rear tires on exit in a few of the turns, so I up shift to reduce the wheel spin. You may be doing the same thing?
All I've done to add exit steering is tweak the shock extension and front toe out to suit the moment. But there is a fine line.
As SCClockDr said, the LSD is also a big factor. Yet I'm at 5/15/15, totally different then he is.
All about the combinations. Still working on it, as most of us are.
I'd really like to find out rajhcore's set up. He was running 1:52's on occasion, 1:53's easy and sub 5:46 total times!!!