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I used a 12" Meade SCT for many years.
A couple of comments:
The star must be re-positioned every time back to the centre of the field of view. You may need a cross wire eyepiece to verify position.
I found on a couple I tested, that the front correcting plate retaining screws had been tightened by the Incredible Hulk!!!! and caused some distortions.
Just check that these screws are finger tight no need to have have them over tight.
Always finish focusing with a anti-clock turn of the focus knob, this will keep the mirror "pushed" to the same side. There's a balance spring behind the mirror in the 12" SCT.
I fitted a mirror lock (as per the MAPUG site) to reduce mirror movement - I do spectroscopy.
I sounds like you're doing things correctly - don't panic
Ken
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