I use rudder to elevator and rudder to aileron. After these were added it flies like a completly different plane. Still have troubles however at the top and bottom of ke loops where the rudder is either not having as much effect or having less affect on the resulting coupling caused by the rudder, but, the ailerons and elevator that are mixed seem to have too much effect. That is what it seems like anyways. I would be curious if someone has tried the always offset flaps. That has worked on other planes to correct the ke pitch coupling.