To me, the [OIII] is now hugely better. Ignoring the H-alpha and ignoring the question of the palette, and going for the last 5% in the [OIII], it is a bit burned out in the core of the Flame, but there is room for very slightly more push in the [OIII] mid-tones before it gets too gritty. You might therefore be able to reprocess it with a stronger curve, but less linear stretch (less white point clipping), so that the mid-level [OIII] generally is as bright or even brighter than you have it, without burning out the extreme highlights. Avoiding burning out the [OIII] in the core of the Flame is most easily done if you can temporarily turn off the H-alpha channel so it isn't distracting you. Then turn the H-alpha back on again when you've finished. Narrowband images are most easily optimised one channel at a time. Hope that helps.
