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With respect to the images in your Mak.
1. Check the obvious first. It's a cold night, make sure you aren't looking over someone's chimney. Are the stars twinkling a lot in the area where you are looking?
2. Maks need an hour or two to settle down. You can see heat distortion on planets and stars in focused and defocused images - it all goes in one direction.
3. After two hours have elapsed, and you are sure the previously mentioned aren't affecting anything. Check a brightish star at high power, and see whether the diffraction rings around it are perfectly round. Or throw the image out of focus - one direction shows a better bulls-eye pattern than the other (at least that's the case with my two Maks) - and see how concentric the rings of the Bulls-eye pattern are. If the pattern is just slightly off being concentric, the images will suffer. You'd need to collimate the telescope, if that is the case.
Cheers,
Renato
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