It looks almost like you have rotation in your 90 second sub, the stars trail about some point in the image, instead of in a consistant direction,
which to me would seem like your polar alignment was a little off, PHD has "drift alignment" which could help with that.
Your DEC backlash seemed to get much worse towards the end, was that something like a merdian flip or something else changing up the balance? that could also be a contributing factor, but frankly it doesn't explain the stars trailing in different directions in different parts of the image.
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