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Ok, found the problem.
First off I was starting to think I had bad spherical aberration based on the star test. Turns out I don't have any significant levels of SA, I just hadn't defocused enough. Apparently you should do that test at about 10 waves of defocus and mine was at about 4. Tests at an appropriate level of defocus show no signs of SA.
Aaaand I think I fixed the astigmatism. I tried to turn the primary in its cell and found it was jammed up on the rear supports. After releasing that and recollimating my stars are round and small. Still not entirely sure what happened there... maybe humidity and the cork pads? Good to have something working again anyway, was starting to lose what little hair I have left!
To top it all off, looks like we actually have some clear skies ahead. Even snuck in about 2.5hrs of data last night before the clouds rolled in.
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