The CLS doesn't perform as well on galaxies as it does with nebula but if your LP is bad it may still help some. Hard to say how much.
You may not have a blue tint if your LP is from orange sodium lights.
Narrow band filters are mainly for nebula. Galaxies have too wide a bandwidth to work effectively with them.
I think DGM make a galaxy filter. The effect is mild so I wouldn't expect too much from one.
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