I have a Futaba S3010 high torque digital servo hooked up to the elevator of my Jet Legend Goshawk. I just hooked it up to the receiver for the first time and it is fluttering up and down about 1/16th inch very rapidly (dissapates over a few seconds) and "vibrates" as it moves up and down when the elevator stick is moved on the Tx. It is also buzzing. Any suggestions on the most likely cause? If I reach inside the fuse and push forward on the servo arm lightly it goes away. I have not balanced the stab but was told it is not necessary.