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From the orientation of the camera can you tell which direction the coma is facing. I mean is the coma radial to the optical axis? Do the images on the opposite side appear OK?
Which version of the Lumicon guider are you using?
Do your prime images show any coma at the edges??
I have the Lumicon Newtonian 2" version ( as I use the #1209 zero shift focuser) on the 12" Lx200 and never noticed excessive coma in the guider. Likewise I sometimes use the old Celestron Radial OAG and there may be some distortions of the star image but they are "constant" if you know what I mean, across the FOV.
Maybe as simple as something in the light train being out of sqaure???
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