Its also worth checking that your steering rack is really free and not binding in any way. I had the same issue, and it was due to the servo needing to draw loads of power because my steering rack was stiff (thread lock on a pivot). Once i had loosened it up, the problem went away.
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Tom
TLR 22-4 2.0, TLR 22 5.0 AC Elite,
Kindly Supported by Trackside Spares, TLR, Spektrum and Horizon Hobby
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