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My experience with full frame sensors is you need 3 inch plus focusers and accessories. That was with an STL11 camera and a Tak FS152. Taks' 2.7 inch focuser and accessories vignetted badly.
As you say you could test it out with a full frame DSLR or mirrorless camera easily enough if you can mount it. Its more the correction so the corner stars are pinpoint rather than vignetting. Vignetting is fixed with good flats. All my scopes need that anyway. But if the correctors don't have a large enough corrected circle (44mm for full frame) then you are going to have to crop a significant part of the image so you may as well have used an APSc sensor in the first place.
The variable slightly dark lines in the darks would process out if the sensor were dithered. It also may not show up in an image anyway as its quite dark and background and not very bright. I did have trouble with a grid pattern noise with my Trius 694 camera sometimes. A good bias used to fix it.
These type sensors probably don't even need darks as there is hardly any noise in them. Perhaps just a bias or nothing at all (perhaps a flat).
Greg.
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