ORIGINAL: dirtybird
If the servos are on opposite sides of the airplane I wonder why you are using two channels for the servo's. Trying to match the servos with mixing just makes it harder to match the travel of the servos. The programmer will help but it still will be hard.
I think it you want to hard connect two servos to a surface you will be better off not using digital servos. Their tighter feedback loop will make it harder to match them.
Thanks for the feedback dirtybird
I'm ahead of you. While waiting for some feedback I placed both on a Y harness with a big improvement. I now do not have enough counterclockwise movement but clockwise is fine and I'm now getting both high and low rates. Meeting a friend at the field in the AM and we will try to reprogram the servo since now they are both on ch4.
Pete