Hi Dan.
I hope by now your collimation woes are over. I just thought I'd add a few more bits to consider.
Primary mirror springs. All is good when you have the scope collimated standing still, then you move it and it's out again. The springs should be reasonably tight.
Primary mirror cell. Check all screw threads. Use blue Teflon tape on the screws which are a tad loose.
Focuser. Ensure it's seated firmly against the tube. Check the motion so it moves smoothly in and out without play.
Hope this helps. Cheers!
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