[glend (Glen)]

It is a good start Kevin. I would not worry to much about your camera color balance as it can be fixed in final processing. And no you don't need to worry about flats yet. That said, i used to run my Canon with a floro (4k) colour balance, but that was a modified ( LP1 filter removed) camera. If your stacking those 7 subs in DSS, don't mess with them first, get your final stacked RAW file and take it to your final processing software. I could tell you how to fix it in Photoshop but that won't help you. If you have an auto colour correction option try that, if you can manipulate the balance of RGB, just dial back the blue slighly. It should not affect the overall luminance. Some software has a box to tick to "preserve luminance" when making adjustments.
Good luck. Its amazing you could get what you did under that massive street light.
One other thing, you are stacking the fringe killer and the CLS, it is probably worth looking at the sprectum passed by each. The CLS seems to let through alot of Oiii (blue) and Ha (red) so your image is no surprise as looking like a narrowband image, over lay the fringe killer and have a look at what gets through. I think you might be ok with just the CLS, or at least try it to gauge the difference.