Thanks so much everyone. So many nice comments.
Ahmed, that would be much appreciated. I think it's mostly the primary mirror I am having issues with. The secondary mirror seems to hold collimation well, but it's still quite early to say for sure.
I also tightened the tension screw a little more, and noticed that collimation held better after the meridian flip, so I think I am suffering from flexure in the focuser. Again, too early to say for sure though.
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