Hi Nick,
Not sure what gear you have apart from your Dob or whether you are manually tracking or using a tracking amount but rest assured with practice what ever approach you are using you will soon get better pictures of the planets. Only 4 Jupiter moons to be easily detected with your gear I think as the others are far fainter. Jupiter will have a much better window for imaging in a few months time as it approaches opposition but putting in some hours in the meantime will get you up to speed when that comes.
The only issue with improvements is that it can be hard to know when to stop so just find the level you are happy with.
There are many links on planetary imaging techniques, some of these are a bit old or may use different gear than that which you wish to use but they may give you some ideas.
http://shortcircuits...lar-system.html
http://planetaryimagingtutorials.com/
I am not sure on this link as the forum just went down as I was trying to check it.
https://www.cloudynights.com/topic/6...planets/page-1