KE tendency is much less when the CG is kept forward of 5.25" mark. I don't use any mixing, as the coupling is not linear with rudder input. I just use stick compensation. I have my UCD w/ YS 110. CG is at around 5.25" mark. I make up the "relatively" forward CG by maximizing elevator & rudder throws. I mounted the rudder servo inverted under the fuse just in front of the tail ramp, controlling rudder with pull-pull. This allows the elevators to go much lower without hitting rudder pushrod.