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Ahhh - that explains it I think. The reflector, the coma corrector, the distance from the chip, the 1 1/4 inch nose piece is going to conspire against you with vignetting for sure.
I would strongly recommend a 2 inch adaptor + the coma corrector becuase you dont have to worry about a filter wheel as it is an OSC and so distance from chip should not be too much of an issue for you with regards to the correct spacing for the coma corrector.
I think that will make a huge differenc to your images with an even spread of light across the chip!
Looking forward to seeing them
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