I used futaba servos. followed guidelines on page 19 and 20 of the manual. Since the servo arms are pull-pull setups, it took quite a bit of adjusting to get the servo buzz under control especially the fwd/aft cyclic.
All i could really do was ensure the servo linkages were as parallel as possible, then adjust linkages to stop the buzzing. It was a pain in the @#*$*%&.
Maybe someone else has a better way. good luck.