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Hi Shawn,
If you are getting concentric rings around out of focus star when it is centred in field of view, and using high magnification ie. 5mm eyepiece. I would ignore what you see when looking down the tube from the corrector end.
Pleased to hear that you have almost no mirror flop, but was that also at high magnification. My LX200 14" at 1200x = when imaging Jupiter the image will move 2 fields of view, on the laptop from one side of focus to the other. But at say 200x it would be almost nothing. I gather that you will be mainly using your scope on DSOs, so you may not have tested your scope at such high magnification.
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