I am speaking from my own personal experience with my 85MG servo. Your experiences may vary however I had no issues with mine. I eventually made the switch to digital but definitely for the price, the 85MG was a solid servo.
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Intelligentsia
"For Every Action There Is An Equal And Opposite Reaction."
Your doing fine man.....if i were you i would go with the hitec and try that out, if they did fix the centering issues with it then you can always write a review and recommend it too others.
i bought the s3102 because the guy selling the car to me said that he used to use futaba servo;s and that the package comes with the futaba servo saver...so i might aswell