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Firstly the actual image of the Skull looks very good and you are almost resolving that double star at the centre.
The donuts are from dust on your filters. So try cleaning your filters with a photographic lens cleaning cloth and a hurricane blower. Also clean your CCD window if the same dust donuts appear with any filter showing its on the window.
The vignetting will flat field out.
The frost and water damage is more the concern. It could be a fatal error and time to look at a new camera and one that does not do that. Starlight Express, FLI, Apogee cameras all have argon in the ccd chamber and do not need desiccant nor frost over. Perhaps consider one of those. QHY are popular and inexpensive so perhaps check out if they are reliable. QSI does not have this problem either as far as I know.
Greg.
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