I agree with Jaka on getting the slop out of the system and mechanically trimming the airplane as much as possible before going to electronic trim. Personally I too am not a big fan of dual rates, my thumbs provide that function. I do however use expo the value differs airplane to airplane, and control surface to control surface. I use expo to dampen out cross controlling; for example if I move the right stick wishing to apply elevator if the ailerons move I will add aileron expo to remove that issue and so forth. Most of the time my expo is setup around 35-40% on most of my airplanes. I have flown another pilot's airplane with high expo's around 80% finding it to be uncomfortable for me making the stick movements too large before the surfaces move, bringing on the control surface movements on too quick (too much throw all at once) once the stick reaches the point to where control is activated beyond the expo dampening point. To each their own, I prefer my setups to be more linear.