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shot looks fine,
jpegs limit your limit to push the image being only 8 bit ie 256 variations for each color chanel. you will get away with it to some degree on a bright object but when you do a dim one you will come undone to some degree. 12 bit gives you 4000 plus variations so if you are trying to enhance a faint object you can get more graduations without banding and speckling. thats why the ccd cameras are 16 or more bits .... just gives you more flexibility.
you can always just convert your 12 bit Raw images into Tiffs using Canons proprietary program (although tiffs are 16 bit you really only captured 12) then stack the tiffs in deepsky stacker or another program, thus bypassing the hassle that some programs have with RAW files. Ultimately this will give you a better image as you progress with your imaging.
cheers clive.
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