Hi Cluster,
While I don't have the GSO, I do have a 6" f5(Orion optics I think?) and it is very sharp when freshly collimated. Coma really only appears at the extreme edges of the FOV.
Have you tried observing after collimating with the Cheshire only?
If not, I say ditch the laser collimation and start over with the Cheshire and see how it is.
Or even just eye-ball it 'till it looks right and see how that goes.
As the saying goes, 'if it looks right, it usually is'.
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If I line up all the mirrors with a Cheshire so they look ok
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