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Hi Aidan,
Very unusual to get elongated stars at 2 secs exposure.
You may have to go through a process of elimination.
Are the longer lengths aligned with the RA axis? If so this would suggest a tracking issue and not collimation.
You can eliminate the guidecam and track unguided with good polar alignment.
You can eliminate the QHY9 as the problem by looking through an eyepiece.
Otherwise see if the problem disappears in different areas of the sky which may suggest a balance problem.
It could also be vibration, make sure the camera is bolted down tight.
Regards
Bill
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