well you may have a problem...using a Y harness you can not reverse one servo with your radio....the servos need to opposite of each other or the servo arms opposite of each other...in other words both servos facing each other or away from each other if mounted on their sides or the servo arms either point toward or away from each other if the servos are mounted flat.
Now this is not the end of the world... hook up the second aileron servo to another channel in your radio which is best or get a reversing Y...In a Futaba set up I think its channel 2 and 6 I'm not sure on JR/Spektrum