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An interesting experiment, worth doing.
Your zero point (dark point) can take some serious adjustment, especially in the blue. Set the zero point sliders separately for each channel until the foothill of the histogram (point where the left hand edge just kicks upward from zero) is almost touching the x-axis. You'll get enormously more contrast without losing one single photon of data.
Hard to know how to handle the colour balance of the brights when using a nebula filter, as you'll be mostly seeing red H-alpha and cyan OIII, but you can't even begin to do so until you've got the black point right.
If you do that, you'll see that you've got much more data there than first meets the eye.
Hope that helps.
Mike
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