Good heavens, ditch the Y-harness and use the X9303's functions for your dual elevator servos!!!!!

Just follow the step by step instructions in your manual and that should be sufficient information to get you going. You can also check out these articles on setting up the XP9303, which has almost identical programming but slightly different wording, for some more information;

http://www.horizonhobby.com/Articles...ArticleID=1429

http://www.horizonhobby.com/Articles...ArticleID=1430

You'll also find some additional information on this page if you scroll down to the "Manuals" section.

http://www.horizonhobby.com/Products...ProdID=JRP9248

Just take your time and it'll surprise you how easy it is to setup once you become more familiar with the radio's features....