It sounds like at first you were definitely dealing with a mirror that was still cooling down. If you looked at Jupiter at 200x just after taking the telescope outside I can imagine that it would have looked pretty soft.
Seeing conditions are another issue, when the seeing isn't great (like it has been in Vic for ages!) then it doesn't matter how long the 10" is out, anything over 150x will just look soft not matter what.
Collimation is another aspect that robs contrast away from the planetary views. The moon is very forgiving
