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This is a contentious topic Alex, different people have different colour preferences. There are, as you noticed, several ways to treat narrowband colouring.
Your Ha Oiii Sii Can be mapped to respective R G B layers in Photoshop, but the traditional Hubble Pallet refers to mapping Sii to R, Ha to G, and Oiii to B.
In Photoshop you can use the slide bar to alter the colour the for you respective layers, so you can tune it to suit your preferences. Obviously where you have high saturation of Ha, like in some emission nebula, you can reduce the saturation level if you wish.
As far as Luminance is concerned, my preference in narrowband is to make an Ha layer for Luminance, and work with the Opacity setting to get the best result. Straight luminance in white light is just to overpowering imho for use in narrowband.
There are many Photoshop online tutorials that really help with layer blending and It's worth learning the techniques.
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