Set your servo back for now. If you need that extra bit of weight then you could move it forward provided the tie-rods remain inline. As for the ball studs on the s-saver, you could have them either way as long as there's no contact with ball end and servo while at full throw. The s-saver should allow you to set-up with short ball studs and not make contact with the servo. I have tried it both ways and moving weight forward made the car less twitchy and scrubbed more tire.