Hello Nick,
This doesn't look like 3.5 hours of data. Either something has gone wrong during DSS stacking or post processing. It looks like there is no colour at all and you have darkened the background too much.
I suggest you reset DSS to default settings then restack your data. Go to saturation and increase it to about 14% (you don't have to do this but it will increase the colour a bit). Then go to RGB/K levels and use the left sliders to bring the colour peaks down to where the histogram drops off (about half way) and all peaks to the same point - this will balance the colour a bit. You can play with these levels until the image looks reasonably balanced. Don't make it too dark - you can fix this later.
Your image should look better already. Then save it and do post processing. Photoshop is good (but expensive) or you can use a free software (google and download) called GIMP. It isn't as good as photoshop but it is free and has similar features. There are other software available Pixinsights is popular.
Good luck - I'm happy to help more once you have a better image to work with. I'm no expert but I can help a bit.
Regards,
Tony.
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