Nice one Dave
I would try the 1.8x Barlow for sure as that puts it in the sweet spot for the camera.
A couple of tips... keep your ROI as small as you can as it means you can kick up the fps in the spirit of being "lucky". With Jupiter it rotates so quickly at this kind of focal length that you want to run the fps as fast as you dare to increase the odds of getting enough good frames from a single stack.
Try dialling the blue channel back a bit - check your settings in the capture program for the R/G/B values. You can fix this is processing just by applying a small curves adjustment in the editor of your choice, so that the white zones on the planet are more neutral white. You can also get good results from hitting the RGB balance button in Registax 6.
I wouldn't worry too much with the ADC this year, it's mostly useful when the altitude of the planet is getting down to around 50 degrees, whereas this year Jupiter/Saturn are much higher (at least, up here in QLD
)
Finally, don't forget that the seeing can be fickle. Not only can it fluctuate before our eyes in fractions of a second, but what you get one night - or even minute - can be vastly different from the previous/next. Sometimes we get lucky
