Too far out on the arm maybe, giving too much throw at the rudder?
If you can move it out further on the rudder arm to compensate that is a good thing, the longer the arms are, the smaller the percentage of total movement you get that is caused by the slop in the ball links or clevises (or whatever connections you use).
If you have a short rudder horn and can't compensate, you can drill a new hole in an alloy servo arm furthe in than the pre-drilled one/s.
Paul Upton-Taylor, Greased Weasel Racing.
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