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FIGURED IT OUT.
The 30mm spacer between the camera and the GSO coma corrector.
I tried removing it and there's about a quarter of a stop difference.
So combining the light blocked by the secondary, the vignetting and the 30mm spacer, I can see how that would all add up to about a half a stop.
Conclusion:
I should've spent the extra for the Baader MPCC, which doesn't require as much spacing (and would have saved a lot of effort getting the damn thing into the Skywatcher's focuser), instead of going with the cheaper GSO. Sigh. Lesson learned.
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