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do you take darks as well? leaving the lens cap on and taking exposures at the same time exposure as the lights? If it is in camera noise the Darks could eliminate the lines, wont hurt to try. RAW files are not necessarily better, the RAW files are just that, raw. No processing on them so you are working with all available data, including the noise. There is more processing to do with raw images and it takes practice to find what works and what doesn't. If you adjust the curves in PS you can get a darker background as well as bringing out star detail. Try the dark frames, if that doesn't work, then we can rethink what is happening.
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