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Hi Dave.
I've got a 10" newt and will be wondering the same thing in the near future (when I've got my newt EQ-mounted) (I also have a 350D). I also can't get my DMK to focus at prime focus for the same reason.
I've got the moonlite focuser, with I think a 1" spacer. I haven't actually experimented to find out how much in-focus i'm missing to be able to bring it to focus, so I can't actually help you at the moment regarding my moonlite. I'll do some experiments over the next week or so (when I get a chance to get the scope out again) and let you know.
I also want to avoid moving the mirror up the tube if possible, because I want a long focal length for planetary imaging, so I don't want to shorten it at all.. plus, the hassle of extensions for eyepieces etc, i'd rather avoid.
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