Well you dont really need a Y harness. Use the MSA-10 from futaba and it will solve all your problems with the reversing / y harnesses all together. The best part is your can easilly fine tune the elevator halves so they move the same. End point being the most important. The MSA-10 will run up to 4 servos if you have a plane big enough. And you can just ziptie it to the wingtube.