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I've got a 6" and 5" MAK, and used to have a 4" MAK, and their focuser knobs never behaved like what you describe.
MAKs are notorious for needing up to an hour to cool down before delivering steady images on planets.
Don't judge collimation on Mars, just aim at a moderately bright star and put it out of focus, and hopefully observe a bulls-eye pattern of concentric rings forming on one side of focus (the image on my three, had a dark centre on the other side of focus).
That colour variation on Mars is all you typically see. You need high power and a red filter to make the features stand out better.
Regards,
Renato
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