I do not agree with the theory about using a Y results in lower servo performance verses each servo on its own wire because no matter how many servos you have on the plane they are feed through a single wire from the battery. The receiver does not have the ability to amplify the current from the battery so all the power must flow from the battery having only a single wire. Now if the receiver had a capacitor or some way of storing or increasing the available power I could see the benefit of using individual wires for each servo.