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alpal,
There's a reason why people get their DSLRs modified -- to give them a similar spectral response as monochrome CCDs. You need to stop worrying about what your camera shows you in the blue channel (oxygen emission). DSLRs are designed as primarily terrestrial imaging devices. Astrophotographic CCDs are designed to capture as much of the spectrum as possible. What you're seeing is scientific but, with a big splash of subjective creativity.
Once you get over the hurdle of not seeing what you see in /your/ images, you'll want to get your camera modified, or buy a CCD that isn't limited by an IR/UV blocker filter.
H
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