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John, not knowing much about the Nikon 5300 and it's response to Ha wavelengths, I'm suspecting, despite the long exposures, the camera's stock standard sensor is just not able to get enough signal through the L Enhance filter. These narrow band filters are most effective using a modded DSLR camera where the IR cut filter has been removed. I guess what's happened, in your efforts to emphasise the Red channel in the Rosette nebula, you've stretched the image to the point where it is showing up a lot of noise. Even on modded DSLRs these narrow band filters require a lot more exposure to create a good signal response. Why not check out the camera's native Ha signal response by ditching the L-Enhance filter and shoot the same exposure at say 1600 iso and see what it looks like?
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