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It will always look grainy on the preview window, even with Gain set to 0. You'll find that once it's all stacked up the grain will go away, and what speckle is left can be despeckled in PS.
As for colour balance, I set white balance to auto, leave it on the screen for 5-10 seconds (or longer when you have tracking), and then uncheck it off auto BEFORE you start capturing. Other things which affect colour (for me), are the saturation setting, and the gamma setting. I set gamma to 0, and saturation to 90-95%. In the end, it comes down to personal preference.
Jupiter is a reddy colour, so I don't know what sort of natural tones you're looking for - I guess when you show us your processed image we'll get a feel for it.
I don't use that blue IR filter, I don't/didn't like it and have returned it. I'm getting the Edmund Scientific one instead, it's $120 (instead of $60), but it's coated and has neutral colour. It should arrive by the end of next week with any luck.
Hope that helps, can't wait to see your result.
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