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Focuser tilt cause uneven star halo? How to align?

MilwaukeeLion
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MilwaukeeLion

MilwaukeeLion

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Took 43 x 3 min subs iso 800 other night.  Brightest stars have uneven halo (bottom left of star only), ran some tests in PI of 1st, middle and last image & contour plot of master flat.  Looks like camera is pointing down vs center, is that what tests show ?  Everything screws together in image train, Esprit 80 - flattener - DSLR nothing loose in between.   If so what's best way to align a  focuser?  

Thank you.

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