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Elliot, that looks a pretty nice picture of 3372, very pleasing to the eye. Maybe a little red for some but I like the contrast and the strong colours you've managed to produce here. I think your star colours look good and the modded dslrs always tend to lean on the red side but hey, you modified it to get more Ha response so it's doing the job. You'll get the hang of better colour balancing tricks as you gain experience. Regarding the coma in those corners, it is a bit odd it only appears in those diagonally opposite ones and not the other side. Is the reducer a field flattener too?
I use a field flattener on my Esprit 100 and it works well on all corners and I now have a coma corrector for my 200mm f 8 Newtonian which has helped heaps with coma at the edges. In your case it could be a tilt problem. Some of my camera lenses, if I use them for widefield shots, exhibit a similar result as what you've shown, especially at low f numbers but I have the ability to stop down a few to eliminate some of those issues. Let's hope someone else can shed a light on resolving your lens aberration problems.
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