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Hi Lewis,
After having a close look at your image I believe you have some tilt as well. The top right corner has definitely better stars than the other 3 corners. Also, the stars in the middle right part of the image are all slightly elongated towards bottom right (instead of being elongated in a horizontal plane).
As for the spacing, I feel you are out by more than a mm, perhaps several mm. I would add a few mm spacer and see if stars get better or worse. Then you will have an idea which way to go.
Please keep us posted.
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