I have a tip for you- the Expo is a handicap. Use it to help you learn to turn smooth and consistent, then as you get better, you can begin to reduce the expo and the only thing you will be adjusting is the dual rate. The reason I know this is because any tiem one of my sponsored or factory buddies drives my car, the first question they ask is: "are your settings linear or close to linear? 'Cause I don't like any curve programmed in..."
So there you go- one of those questions you would love to ask the factory guys, but never get a chance.
It's funny how you buy a high-dollar computer radio for the multitude of settings, then after you learn to drive well, you use very few of them....lol