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Initially I'd suspect polar alignement. You say it's well aligned though. How did you do the polar alignment?
What direction is the drift? Is it definately only RA drift, or is there some DEC drift... Also near the horizon the tracking is sometimes not so good. Try using the "King" rate in this case.
If you can quantify how bad the errors are I maybe able to help more. Use the graph-log fuction in K3CCDTools and then you should be able to quantify exactly what is going on.
Cheers
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