Thanks, guys. The low altitude and fluctuating seeing is one reason I play with the false color. Gives a bit of a different view (as a photochemist, I like thinking of different slices of the spectrum) and resolution is already fairly low so the result is a little less dependent on seeing. Also, the narrow bandpasses counter atmospheric dispersion somewhat.
Or maybe I'm just screwing around.
Anyway, I thought I could make the false color smoother by using more frames and not drizzling. This version is without drizzle in AS2 and using 95% of the frames in UV and methane band (about 2000 and 2200, respectively). I used 5000 frames with the 619nm image (as opposed to just over 3000 in the first go). I think it came out much nicer.
I'm particularly taken with the methane band image. As I said the first time I imaged Saturn in the methane band, it is a ghostly light on screen. But the rings came out quite sharp this time, which surprised me.