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Blurring, elongation in an image could just as well be camera not square or sagging.
How is the camera attached to the OTA via an eyepiece holder or a a rigid screw adapter?
Whilst a Tak eyepiece holder is high quality there may be some sag. Rigid screw adapters are what is really needed for astrophotography.
Do you see this problem visually with eyepieces or only with the CCD.
Tilt is common. Collimation of an APO not so common.
I would post on Tak Uncensored site before I started adjusting the lens cell.
Greg.
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