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Ben, looks good to start with.
I used a f4.5 reflector and would see coma similarly, not as much though. You are showing it in 2 of the pics. You should see the coma in all the corners. If the optical axis isnt the exact same as the mechanical axis then the coma will be asymmetrical. The coma will point towards the centre of the optical axis.
Then you should be able to adjust things. You want the exposure centre to be in the optical centre. I was able to move the primary and/or focusser mount a little and using repeated 4sec exposures and adjustment iterations I could centre the optical axis. See what you can do in real time and recheck collimation.
I do have a Baader multipurpose coma corrector available. What are you using?
GlennB
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