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With the amount of collimation shift that CCDInspector is picking up I’d largely put it down to error in software.
Atmospheric refraction and airmass are linked so you should be able to easily test whether the atmosphere is in play. Going from 40° to 90° on both sides of meridian with zero mechanical play should show a repeatable and calculatable collimation shift with respect to airmass. I think Maxim even gives an airmass value to each exposure in the FITS header, been a while since I looked.
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