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I would guess that your sub exposures are a little short for RC10. f/8 right? All of my FSQ subs are 40 minutes with the 16803.
I'd double the exposure time for your subs and do a lot of them.
There is great deal of information in that image. The 6303 has massive QE at 656nm, so just continue to add exposure, you'll see the SNR change dramatically.
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