I use the settings in the images below. This allows me to cruise hands-off at around 500km/h and 1.4 ata with the plane keeping the same heading without any rudder input.
As you can see, i also adjusted the pitch curve so the plane maintains level flight in the conditions mentioned above with elevator trim set to 0. That's why the center position is offset a little (43% compared to the usual 50%). For take-off i use full nose-down trim though.
For different speeds or power settings you have to compensate with the controls, but it doesn't need too much aileron to keep it horizontal. It does require a bit of work on the rudder if you change the power setting.
