I often find that servos move real quick around center. Just a little wheel movement makes my sterring jump alot.
I dial in negative expo unitl I can move my front tires smoothly just a little bit. Like going down a straight. Usually -30%.
Then program one of your trim switches to adjust your brake EPA. Pick one you can reach easy, so that you can reduce or increase your brakes during the main if track conditions change. For example I'll dial my brakes down as the track dies, and a wet track can dry dusty quick on a summer day.
Dual rate is linear. It's a quicky way to dial down steering while driveing. It works like EPA. I set mine to 100% (off) and rarely touch it. Some racers like to play with it. It should be a switch or wheel on most radios.
I'm on the Airtronics side of the fence so I'm not sure exactly what deos what on a Fuuty.