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I don't use Firecapture, I tried it once and it didn't seem to do what I was attempting (I must try it again sometime), so I use the bundled EZPlanetary.
It sounds like you're hitting the speed limit of USB 2. I only use a little 5-year old netbook and it can only manage 8fps at 1280, but runs faster with lower resolution. Last year I was using 320x240 with Mars, but Jupiter is too big for that and no doubt at f/40 it's huge...
People with the faster mono cameras are no doubt using USB 3 too.
Oh btw, look for a USB traffic option and set to as low a value as possible.
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