Hey Ash
They're pretty good - I agree the 31/10 doesn't look quite as sharp.
Maybe it's as simple as the seeing wasn't as good?
Maybe the processing is letting you down?
Also don't forget that Jupiter is a long way past opposition now and it's getting very difficult to get a good image of it since it's only visible right after sunset for a short while.
What camera and filters are you using? How long are you capturing for?
What's your processing routine?
I'm not a fan of the RG composites.. I'd only use that technique if you weren't able to capture a B channel at all due to clouds or something.
The colour will always be off if you don't use a real B channel. and when the seeing is good, B has a wealth of high contrast data in there, especially when the GRS is visible.