CEEGEE - how are you connecting the elevator servos to the receiver? Are you using a "Y" connector or two channels on your receiver? The 6EXA has one programmable mix that you could possibly use to operate the two elevator servos and you would not need an inline reverser, you could just reverse the slave channel to match you master channel. Check out you owners manual for the radio, I believe it talks about it on page 12.

Hope this helps.