WHat Mode are you trying to use?

90% of the US uses Mode 2.
1) Ailerons
2) Elevator
3) Throttle
4) Rudder

I believe that the 6EXA has the ability to use either mode 1 oe 2, but not 3 or 4, unless you play with the channels that you plug the servos into.

Plug your servos into the channels listed above, then make sure your Tx is set to Mode 2, you'll have dual rates on Ailerons, Elevator and Rudder.
Dennis-