Great start! Saturn particularly nice. Jupiter focuses much more easily when GRS is in view. I also have a C8 on a EVO and so can relate to your experience. Seeing can be everything in determining the quality of the images, so hard to judge a single instance but I suspect there is considerable (blue) noise from processing a small number of frames and pushing for detail and brightness. If so the following may help. There are also tutorials online including for your camera.
Your frames per second sounds very low for a planetary camera, these are very different to DSLRs. Adjust exposure to try and get enough frames to have in the order of multi thousand frames in your AS!2 quality stack). Yes for Jupiter use either a 3 minute run with your histogram (if your capture software has one, I use firecapture and a (ZWO224mc) at 40-60% or 2 minutes is imaging its moons and perhaps using Winjupos. Use longer captures for Saturn say 5-6 minutes, its further away, captures not so affected by its rotation and not as bright so you will catch less frames.
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