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The first one looks like problems with backlash overcompensating. This may be due to the worm being a bit sticky. What is the software you are using for guidiing?
I have found I get better results with backlash compensation turned off as I seem to have inconsistent backlash.
I'm not sure about the middle exposure.
do you have the guider oriented so that corrections are in RA or Dec rather than needing to correct both axis when the star wanders just on RA?
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