Just terrific Paul, awesome shot. The first shot looks really smooth, but almost too smooth. It looks like it could do with a bit of unsharp mask.
I (personally) prefer one of the lower ones in your composite, because the detail on the disc looks sharper.
I'm not sure why your colour is different than mine.. When I shot thru Rod's LX200 last friday, my images turn out much different in colour, with the rings a pale shade of white. The settings I used were almost identical to what I use at home.
Have you tried increasing the image scale with a bigger barlow (or stacked barlows)? What's the focal length of your 8"?