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Even though i had a good walk back test, at every distance change i would have to adjust my windage, sometimes by quite a lot
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That's a bit of a contradiction in terms. Suggests your walkback methodology is faulty. Would recommend a walk back only as a verification check on a bareshaft method. (And though others might not agree IMO for the average archer can be used for some degree of micro-tuning of the button spring).
As far as sight bar alignment goes I would check the high-low pin alignment with sight bar fully extended and fully retracted i.e. 4 points. If the sight extender not parallel to the bow plane you can also get right-left issues if you change the extension length for different distances.