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Two things I've noted with a 400D
1) I think ISO 800 on bulb shots is the sweet point
2) Noise reduction is default on for shots > 30 seconds, (the camera will automatically take a dark frame for the same length as your exposure and subtract it) turning it off doesn't seem to dramatically decrease shots quality - but it halves exposure time. So maybe ignore it or at most take 1, 2, 3, 4, 5, 6, 7, 8, 9 , 10 minute dark frames and use these in DeepSkyStacker (Freeware)
Also suggest if you're imaging near mains - get a AC / DC converter.
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