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The drift is due to not being 100% polar aligned. The reason you are seeing it in your main telescope and not your guide scope is because the effective focal length (E.F.L.) of the main telescope with 2x Powermate attached is much greater than that of the guide scope.
You have 250 x 4 x 2= 2000mm E.F.L. for the main telescope. What guide scope and eyepiece are you using?
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