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Troy, as I said else where well done.
Jupiter will be different to capture. You should be able to have a full histogram in each channel with that planet. Saturn is a hard one to cut your teeth with. It's brightness levels are very different from Jupiter and that makes it very hard to image.
Your question relating to full gain can be explained as follows. If you use the same gain levels on each planet you can manipulate the exposure and frames per second to adjust the histogram. Mars for instance will have differing exposure and frames per second than Jupiter and Jupiter will be different from Saturn and all vice versa.
These camera's exhibit such low levels of noise at high gain, the only thing that is stopping the image from being smooth will be the amount of frames you are stacking. Remember also the larger the image scale the less light you have falling on the chip at any one point in time. You cannot push the scale too far as your image will not be illuminated correctly. This is why we always go back to the histogram.
With some trial and error you will be working on the right track. You already have a great start, you just need to work on things from here. I would recommend reading a couple of books on photographic principles and in particular the way light interacts with the any particular medium. After all you are still doing photography.
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