Let me delve into that manual a bit more. Well shoot, can't find anything. I suppose they could have flashed the transmitter for the airplane you were flying to do V-Tail instead of Elevons. Normally I've seen a switch to turn it from one to the other. You might try popping the back off and looking for something inside. You COULD see about swapping the rudder and Elevon connections, don't know if they were kind enough to have separate plugs for each, generally they're just wires in a group from one gimble or the other. Rats, thought we had it figured out.
When does that 9x get in? Mine is due next Wednesday and I ordered it Friday last week. DANG took em a week to ship the darn thing.