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Is the arrangement and spacing OK?
I can't comment specifically on your rig as I've only seen a Canon DSLR in use with that reducer on an ED80. On that rig, the corrector was mounted to the DSLR's T-ring. This would have given around 55mm backfocus from corrector to the sensor.
You might already have the ~48.5mm needed (if my thinking is correct) but if you don't it might be something to look at.
If you're concerned it might be the sensor - take the reducer out of the equation and see if you get a field with different illumination (though it wont be flat).
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