This is my version of the same data.
I don't seem to have the same separation you achieved between the SNR and the rest of the nebulosity, and it is missing some warmth. I also found quite a lot of O3 signal amongst the broader nebulosity.
But it is what it is.
Well... beautiful nevertheless and simply a different interpretation of the data. FYI, I am using masks to increase the separation. Sometimes the colour masks from PI are enough, other times I use for example the Oiii data to create a mask.
All the best
Manuel