Hi Dan
I think you got it pretty right myself. There must be OIII in the tarantula. My effort a few years ago with an unmodded 450D is here (although hardly any kind of serious reference
)
https://picasaweb.google.com/UserRob...89617865958914
The IDAS filters are reknowned for being relatively straightforward to colour process. I usually find myself cutting the blues, a bit of green and perhaps a slight red boost. Ultimately you should approx aim to balance the histogram, as you've done. It looks like you've succeeded in starting to bring out surrounding pink Hydrogen too. Many prefer the most "honest" colours from an unmodded camera, albeit with reduced sensitivity. M42 is bound to come out with more green and blue too, but I found for a lot of other targets it really didn't matter too much (obviously doesn't apply to objects composed primarily of hydrogen glowing pink).
It's surprising really just how good filtered images can be from the 'burbs. Certainly you see a lot more than you'll see visually in a mid-sized telescope.