652 flaperon set-up
Do a mix, channel 6 to 6 in an open programmable mix, and set the values to -100% with the flap switch in both positions. This will center the servos properly. Then to set the travel you will want to set the flap servo mechanically to get the travel you are wanting, then use the aileron servo travel adjustment to match the servo plugged into the aileron channel to the flap servo.