Hi Justin,
I've seen similar issues posted here and it was attributed to the ccd plane not being perfectly square to the optical axis.
Have you checked for slop in the focuser or the 2" tube ring that hold your camera.
Also, check the vertical offset using a sight tube. I use a 2" extension tube as a sight tube. It needs to be centered in the sight tube.
Laser collimators don't reveal all.
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