I take on board what you guys say, but personally, I was underwhelmed by the view of jupiter, also.
I have ordered a collimator, though. Unfortunately for this weekend, the mailman has failed me. This is probably why brisbane's skies are comparatively clear tonight
I think my scope may need more cooling time. It is a solid tube 12 inch dob without the fan running which I assume is one of the worst prospects for cooling time. I was out for maybe 2 hours and the view did seem to improve but I think it wasn't enough.
I'm sure, patience, experience.. and the wallet will improve things.