Changing wheels on my 2010 flhx to RC chrome wheels,,,,question is thinking on staying the same in size (18 front 16 rear) should I go to one rotor or stay with two?? How will one change stopping power and what should I do to regain what I lose by going to one rotor??? really need some answers to make the right choice, Harley said not to go to one, to stay with two???? help!!!!