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How well have you polar aligned? What method did you use and in what part/s of the sky?
If you say polar aligned using a drift method in the area of the sky you are imaging I would not expect to see the drift you are encountering. Given atomspheric refraction varies slightly at different elevations - it is kind of impossible to have perfect polar alignment in all parts of the sky. Whether you are perfectly zoned in on the Celestial pole or the refracted celestial pole - you will get some Dec drift in various parts of the sky. I have read many debates about this between the Bisque Brothers pushing Tpoint vs the five or so most common drift alignment techniques.
Two suggestions - check and report if drift is consistent in all quadrants of the sky and at all elevations and try to see how much atomspheric jitter you are seeing on a still night versus a turbulent clear night. You don't want to be chasing the seeing.
Hope this helps!
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