[ddlstang]

At center with no weight on the control surface there will be little or no draw on the servo ( no humming ). There will definitely be a draw of power if the servo is working at all - which just the weight of the control surface will make it work. If the servos are fighting each other you will notice that in the sound or the amp draw during deflection. You can hook up the amp meter and do a baseline on the master servo and then check the others to see how muc hof a difference there is and if they are fighting each other.

You shouldn't have any problems at all if your horns are adjusted out correctly.