It's actually all channels except red
but I'll give it a try.
Here's the short exposure run. That's a lot closer but too much red now, it's causing halos
[edit]
Using the
Exposure Calulator it looks like my exposures on M8 are way longer than they need to be and my G2V figures are wrong. I need to do that G2V check again but here's an M83 manually corrected with new figures. Not perfect but getting there.