Hi Tony, not a bad image. I've used an 8" SCT (+ 900NC) on Saturn a few times and realistically speaking, 3X (F30) will be your maximum. I used to quite frequently run maxed out gain, & while most times you would see these lines in the live feed, if you have enough frames to stack, they would be averaged out in the final image. It's also linked with frame rate. No more than 10FPS is highly recommended.
Remember also that you can shoot Saturn for a max. time of 6 mins. In 5/10 + seeing, you should receive enough good frames for a nice stack.
Keep practicing & good luck
