Hmm, Saturn would have been around 40 degrees above the horizon at that time, and I would have expected that you should be able to resolve the ring system reasonably well with an 8” scope? Even if your mirror had not cooled down fully, the rings should have been visible?
Is the ‘scope collimated? If not, Google “Newtonian collimation” and have a read up on how to check if your ‘scope is collimated.
Cheers
Dennis
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