Thank you for sharing your photos - this is exactly what this project is all about! :-)
I guess I missed it, the last color object with a monochrome camera. The hydrogen data is, of course, collected in abundance. But its color overwhelms all the other colors. For now, let it stay like this.
Upd: I remembered that there's no L channel in this stack, so I removed it.
Try reducing the number of frames for the red channel, or stretch the blue and green channels separately, then gradually stretch the red channel a bit.
I think the issue here isn't about honesty, and yes, we all essentially "paint" the data—how could we not? The point is that we need to blend the three channels not in exact proportions per frame, but according to the signal level of the gas. If one gas emits faintly on its own, then its signal should be given more weight.
As in two-shot cameras. When you combine everything, the difference in signal between different interpolation channels turns it into mush, and then we extract color from that mush. Here it's the same, only the interpolation is done manually when combining the channels.
Try also performing alignment to a reference frame before pixel math, matching all other frames to the brightest red one—I can’t recall what this is called in PixInsight. In Siril, it’s called linear matching.
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