It's very unlikely that the EPA will be 100% in any car, ever.
First, set the dual-rate to 100%. Then, set the EPA so that the steering reaches full lock, no more, no less, without straining the servo. Obviously the steering linkages will already have been set up evenly, and the servo sub-trim will be used to set the servo neutral position.
You can now use the dual rate control to decrease steering lock if the track requires it. I generally start with enough lock to turn full circle in the narrowest normal section of the track, would rarely go more than 10% different from that.
To change the feel of the car on small stick movements, use the exponential - NOT the dual rate. Again, only 10% adjustment should be needed - more than that and you start to mask the cars handling problems and end up with controls that are far from linear.
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