I always put in some expo on my rudder, that way when I up the throttle the rudder doesn't move with it if I am not dead straight as I go up.
Me too, but I fly on mode 1 & tended to pull the elevator stick a bit sideways which added rudder & resulted
in screwy loops.
My radio (Futaba 12 FG) has 'point' mixing so you can set the sticks to have no movement around centre.
My rudder now has a dead spot around centre which has improved my looping manoeuvres.
This doesn't effect rudder expo. - John.