On a 3 channel airplane the rudder should always go on the right side. I actually prefer to do a mix so that rudder will be on both sides, after flying for 43 years I have issues ground steering with my right hand. Having rudder on both makes it easy for me to ground steer with my left hand and fly with my right. Most guys would be similarly accustomed. CG should be 1/3 of the wing cord. No need to go any farther forward then that, it will only make the airplane more difficult to fly and land faster.