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That is astigmatism so something still pinched.....check secondary as well Paul and re check main mirror and loosen clips more.
With the secondary It's well known that silicon can pinch It too and could cause what your seeing.
On my GSO 6" I had to re do the secondary and that fixed the stars but with the GSO 8" the main mirror clips were too tight and once loosened the stars come good.
When using a coma corrector make sure the spacing is spot on....although this isn't the problem I see here.
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