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That's actually a nice image Peter. I don't see any troublesome blue halos here so it looks like you are pretty much on top of that.
Yes longer total exposures is the way to go. Even with my 17 inch 8 hours total is a bit on the light side. 12 hours is a good target. Judging from many of the images here and Rob Gendlers original works 12-30 hours is good depending on the aperture and dark skies, camera sensitivity etc.
I thought the strategy with CCDs was shorter exposures with light pollution ( the sky glow builds up faster than the signal) and longer with dark skies.. Also with the Trius short exposures are a good solution to the haloing effect anyway as Ray's images show.
Greg.
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