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don't know whats happening with the diffraction spike, though your top two corners seem flared quite substantially compared to bottom left, so your collimation is still out to some degree.
Im not sure about Mak newts, as they have the corrector. if the corrector isn't lined up properly your going to have problems.
Using the cats eye gear to get good collimation for the mirrors is easy business, but i think what you might have to have a look at is doing a star test to align the corrector plate. I am only guessing as i have never owned one of these.
Good luck hope you crack the nut.
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