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Simon,
I agree with an earlier comment that the errors you are seeing might be due to seeing given RA and DEC look similar. I think you could judge this by looking at the guiding graphs while not sending guide corrections. Since DEC isn't moving everything you see in terms of excursions would be due to seeing whereas RA would be PE + seeing. Another tool worth experimenting with is the Guiding Assistant in PHD2. It basically does the above and analyses the result making suggestions for exposure duration and min move settings. It also has a tool to measure DEC backlash. On Paramounts the backlash tool doesn't really work (It seems to measure stiction) but it might prove useful with your mount and could quantify adjustments.
Peter
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