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Sounds like DEC was over correcting. Are you using relays or direct guide ?
Suggest you try direct guide if usign relays. Much better results with Direct Guide. Try tone down max move time and min pixel movement. ie make sure it does not chase seeing.
Backlash is almost impossible on these mounts with belt drive and spring loaded worm. You can test using illuminated reticle and a barlow on a star. move dec one way at 1x speed then other. should move both directions immediately. If it does not. Pop off dec cover and do the same test but watch the belt. If you see slack in the belt thats and easy fix to tighten. Just watch the video I posted a while back. It explains how to tension the belt.
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