Hi Nigel they are some very nice images.
I'm by no means any planetary astrophotographer but here are some points i've read / learnt along the way.
Focus on a bright star in live view at a high magnification, then slew over to the planet. it can be difficult to get it right, fine movements are required!
Seeing is pretty much everything; even if it is a clear and windless night, the earth's jetstream could be tearing along overhead. people use the skyskippy site or bom website to check jetstream conditions. anything over 40kts at 200 hPa as i understand it will severly diminish your chances of good seeing - especially at a higher magnification.
Jupiter is very low in the sky this season, with it better suited to the northern hemisphere. this means we have to view it through more atmosphere which degrades the image. However Saturn will be nice and high this season so that is a bonus!
http://www.bom.gov.au/australia/char...t=Refresh+View
Jupiter rotates quite fast and i think i read that movement is detectable in videos of over 1 minute? maybe a bit longer. You could try the derotation program WINJUPOS that many have had success with at getting a sharper results. it can allow you to capture more frames too, which can improve the signal to noise ratio of the image.
http://www.damianpeach.com/barbados10rw.htm
anyway thats about all i can add, i think you've done a fantastic job!
clear skies
Russ