David:

According to what has been said in other thread, maybe your problem of assymetric speed in your elevator is because, in the JR 10 series radios, channel 9 and 10 (Aux 4 and Aux5) are updated at half the rate of the first 8 channels.

Maybe if you mix yor elevator and rudder to channels diferent than Aux 4 and Aux5 the problem will go away.

My 2 cents.

Regards

Eduardo