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You sound as though you are on the right track. You just need a few tricks to improve the sensitivity of your drift detection.
Are you using an illuminated reticule?
Do you have a barlow to increase your focal length and hence the magnification? This will “magnify” any apparent drift.
Perhaps allow a longer period of drift before making adjustments.
At some stage, though, you will reach a point where your mount will not allow any finer, more accurate adjustments.
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