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Your fov looks well balanced. As far as diffraction rings go I reckon you are too far either side of the focus to make a good reading. You need to get closer to focus to see only a couple of rings. Then you'll be able to see which way to go. I usually go out of focus as the image is less impacted by turbulence then push the star towards the opposite direction where the rings are compressed then recenter and so on. I use all screws but I try to balance as not to over tighten any.
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