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The C8 with 20mm wide angle (68 degree?) eyepiece only gives a field of view of about 0.68 degrees. A longer focal length eyepiece or focal reducer would help to widen the FOV.
Something else that might help to line things up is to check that the corrector cell is casting a shadow on the rear cell all the way around it's perimeter (assuming the optical axis and ota mechanical axis are the same).
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