I too use colored coded striping tape to each lead. Red to red alerons, blue to blue retract, white to white flaps. As to flaps and alerons, using a Y is the simplest because it really does not matter which servo lead it is connected to provided you mount the servos arms opposing each other or are facing each other. The same is true to flaps, the arms should be on the same side of the servo when mounted. With the retracts though, there is only one lead and just insure it is plugged into the right receiver connection. Then there is the situation where you have alerons on separate channels. Then you need to color code the leads to the receive to insure they are in the correct connection on the receiver. Other wise you may have to reverse the servos to insure left is left and right is right. Then there is always the fact that I don't understand the quesstion and this is TMI.