I took this image with a 250pds,on AZEQ6 mount in Az mode. Full roi. No Barlow. 100 fps. 2ms exposure. Gain 300. I has to use 2ms to make bands appear, otherwise overexposed. 17000 frames, 10% stacked in autostakkert. Wavelets in registax. Affinity Photo 2 for making GRS appear. It wasn’t visible after autostakkert or registax. It’s my second only attempt, better than my first. I had trouble with my tracking, hence why large roi used. But fps was enough in my opinion. I used an ir/uv cut filter.
I tried to focus by eye. I don't think my tracking issue was helping, as Jupiter was drifting towards edge of frame throughout capture with sharpcap.
Oh, jupiter was around 50° or higher. Seeing was average.
Any advice on improving.
Here is my try using 5x barlow. I have a 5’’ F/5 Newt and a ZWO ASI662MC camera. The image was cropped. So, actually, you could even try 5x Barlow. Hope this helps. 
Hola, yo uso un newton de 200 mm f/4 con barlow x3 y cámara Asi120mm-c, montura eq6r-pro y filtros RGB, mi consejo es que uses barlow x2 o x3, ganancia mínima, entre 0 y 50, y adecuar la exposición a esa ganancia, no vas tener muchos frames supongo, pero hay drama, con unos 90 o 120 segundos de video suficiente para un buen material, si puedes hacer más videos y usar winjupos, mejor, y usar monocrómatica con filtros sería lo ideal. Saludos