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Have you checked Jupiter etc. over the span of a couple nights to rule out any atmospheric distortions or other conditions that may have messed with your ability to get a crisp image?
I'd say make sure that you get all the basics right (including letting your scope cool down sufficiently) and then compare over the course of a few days.
With a mirror that size you'd be well advised to collimate it now, and frequently thereafter - so you should get going on that topic anyway.
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