ok great about the sub trim what will that do? How I have it now is the straightest I can get I think. Should I adjust the subtrim with the servo horn off or connected and should the servo be connected to the motor or not? Any other suggestions would be great.
The sub-trim changes the center of your servo. You want to remove the horn and having everything "on", start decrease/increase your sub-trim until you can install the horn parrallell with the servo.