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After looking at your horsehead shot, the dust is on your DSI and not in your ED80. Anything on your main optics would be so far out of focus that it would degrade your image and not be seen in your photo as "spots". Also you should be able to go longer with the Losmandy mount with PEC and the ED80 in the train as it is not a very demanding combination/focal length. Also is your computer using USB 1 or 2? I might make a guess and say USB1.1? You need USB 2 to run a DSI as it gives horizontal banding with USB1.1.
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