Typically, once the CG is set you set the aileron neutral by putting the plane in a vertical, power off dive. If the plane pulls to canopy, drop the ailerons, if it pushes to the gear, raise the ailerons.

Changing the neutal from the above setting may fix the KE problem but the plane will be out of trim.

My plane only has slight roll coupling is KE, wants to keep rolling to inverted. Easily mixed out.