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Hi Grant,
It still could be stray light, ie your PC, that is being captured by your refractor. It could be gaps around you focuser that are letting in light, it could be being reflected off your dew shield.
Take note of direction of image in regard to ANY light source, you could find that the gradient you see is only in one direction from where you are imaging, or a certain orientation to where you setup your PC. This may help pinpoint the source of the problem.
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