Brendan,
i wonder if the screws of your previous post were interfering with the mirror mechanism so your previous collimation was compensating for it?
Have you tried adjusting your secondary collimation screws yet? Very easy to do and adjust the mirror alignment.
You need to rotate the inner screws slightly, the Owners manual applies even though it is out of date. The secondary mirror and screws on my 14" are the same as the manual and i have followed those instructions which are correct and work well.
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