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Paul,
I'm coming into this discussion a bit late - have been away on holidays.
Can I clarify - are you guiding with PHD or Maxim?
I would expect shift between subs when using Maxim as it suspends guiding whilst downloading from the imaging camera. Unless your polar alignment was 100.00000% and no PE, there would always be some shift between subs. I do have dithering turned on and notice some large corrections in guiding as it resumes guiding after the download. It then settles back down to normal corrections. I hope it's not correcting out the dithering, otherwise what is the point of dithering?
As far as I'm aware, there shouldn't be any issues with the AP controller firmware. They don't have any modelling, so shouldn't be trying to do anything differently in various regions across the sky.
I'm wondering if you have a problem with the mount shifting depending on where you are pointing in the sky. It's well aligned when the weight is hanging in one way, and then moves ever so slightly when the weight shifts. How have you attached the 900 to your pier?
DT
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