I've used EZPlanetary and it's straightforward enough...when you click on the gain or exposure buttons it pops up a keypad, and with the exposure time be sure to check you click the right time frame, i.e. ms.
Try something like 35ms and a gain below 10. I haven't managed to bag Jupiter so far this season, as the seeing has been awful when I've been free, but last year I was capturing Mars and Saturn with a gain around 8 to 10, just note that Jupiter will no doubt he brighter and you'll need to knock it down a bit. Or shorten the exposure time, 20 or 25 ms, depending on the frame size you're using.
How bright/dark it appears will also depend on the focal length/ratio, I was around 7m, f/25.
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