I use GS 3mm shock O-rings (looks cool in clear or blue!) on all ball ends including the camber and torque rods. I also use Teflon plumbing tape directly on the balls and ball ends. The tape comes in two basic thicknesses, one for water fittings other for gas fittings and you can double them up as well. The Tamiya hi torque servo saver is also prone to develop some slop. Replace with Kimbrough medium. Make sure your servo has no movement or top bearing slop. Make sure there is no vertical slop in the steering posts. Use 3mm shims on both the inboard and outboard hinge pins to remove suspension arm slop. You'll be surprised how little slop will be left!
Let me know how you go!