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First of Mike, this is fantastic progress. Now you can see the image and some detail is present.
Second, raise you minimum quality level a bit higher. The better the shots the better the final stack. Bad images create poor stacking and registration. For planets I have used 50-75% rejection on the LPI. Tracking is certainly a problem you will have to overcome. That said, Wes at CN does exactly what you do, I don't think he has any tracking. Aslo consdier that Saturn is unfortunately in a bad position for us at the moment. Even at its highest, it is not anywhere near the zenith. More air to disrupt the image.
Also your focus is still a bit out and I would either check your collimation or get another apo based barlow. I can see blue around the edges in the originals, a sure sign that something is not quite right in the light train. Try to focus on one of the moons, Focusing on stars is ok for deep sky work, but only rough for the planets (at least that is what I have found). And; if you do not already have one, a hartman mask would be good. Then you can focus directly on Saturn itself.
Other than that you have made a huge leap from last time and I expect to see your shots better all the time.
Keep it up.
Paul
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