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Do you have a full sized sample image? Its hard to tell what's going on from that image. Is that a corner crop?
What was the camera setup? Is the scope well collimated?
Tilt can be corrected with spacers. I developed a procedure to handle tilt. Tilt causes one or more corners or even sides of an image to have elongated stars. Not all corners, one or two corners will be sharp and the other 1 or 2 will not be. Sometimes one side is good the other is bad. That's tilt. All 4 corners off would be spacing issues. Comet shaped stars would be collimation.
Greg.
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