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h0ughy your image does what you set out to do that is record the faint dust. Consequently the blue reflection nebs are over exposed and saturated. That is why they are white, RGB are all at maximum. Most people have trouble recording the faint blue reflection nebs let alone a hint of the faint dust.
The lens you used at this focal length is about as good as it gets. Using an aperture in front of the lens rather than the lens's iris will also help contrast. Could I suggest when you try this again take sets of exposures eg 1m 2m 4m 8m 16m? and I will process the data for you using my hdr method. That way you get both the dim dust and no stars saturated. All faint stuff will have colour.
If your guiding software is capable, dithering really helps to suppress the noise when you median stack.
Bert
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