Hi Gavin,
You've got a great image coming together there
Similar question to what Luka asked - which scope/camera did you use?
If you used your Canon 600D, what ISO? When I used my Canon on ISO 1600 I often found the stars were more overwhelming as opposed to using say ISO 800. When that happens, one way to fix is take 2 exposures - one for the DSO (ISO 1600) and one for the stars (ISO 400 or 800). Then you can merge the exposures using the layers. This will prevent the stars from getting washed out & losing their colour.
Where possible it's always best to try and get the cleanest image you can in the field (e.g. optimal focus, good weather, optimum exposure times etc), however, sometimes it's just not possible.
Processing can address some of these concerns which is good news!
Out of curiosity, I downloaded your image and had a play with the stars to see if anything could be done. I'm happy to share my result, however, only with your permission.
Cheers, Evan