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Ooh. Interesting. Sounds like you may have found the cause of the astigmatism given the description of the primary. Hopefully that solves the bulk of your issues.
It's a bit of a drive but you're welcome to borrow my Catseye kit if you want to go down that path Dunk. They're the only collimation tools I have now but I don't use them often 'cause I leave my newt permanently set up.
One thing to note re Catseye is they take a fair bit of learning to use well, so are a bit of an investment in time. To be honest I still don't know if I "get it".
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