I don't have a deadzone but if you have a good wheelprofile from Race07, you can use it.
Drop it in the controlfolder, if you map the buttons in game it changes in a RRRE profile.
How do you view the leaderboards for this track?? Can't see my times? Got rid of the deadzone by adjusting steering lock in game, much better now. I can only use the Saleen aswell is that right?
I think for the Saleen you can only see your position while on track (hit ESC -> Session Settings -> make sure "Session Best" is showing) then you'll get the live leaderboard at the top of the screen.
Aquila can still be used by choosing Leaderboard Challenge on the bottom of the main menu and hitting Start.