My first "real" scope was a C5, the same scope as yours. I had that scope for over 12 years and had untold happy hours with it, and very much pushed it as much as I could.
As Redbetter said, the best image quality happens with the planet as high as possible. Good seeing conditions are also important as it is only with stead atmospheric conditions that the fine detail and subtle low contrast features.
Redbetter also mentioned the importance of having the scope well collimated. If you are not familiar with the term it only means aligning the optics. Unlike a refractor, reflectors of whatever flavour you like (SCT, Newtonian, Maksutov, Classical Cassegrain, etc) have optical components held gently in place with screws and springs, and these optics can shift over time. Thankfully though SCT's and Maks experience the least amount of change and over time. It is a simple process and just ask if you need more info on this.
One other thing that will help you with Jupiter, Saturn and Mars for that matter is an #80A blue filter. This is the single best all-round filter for spotting the majority of features that these three planets have to offer, and works extremely well with a C5.
As for letting your scope cool, this is now a mute point if you insulate the OTA. Thermal issues happen because the tube cools faster than the still warm air, primary mirror and baffle tube inside the OTA. A heat differential is generated and hence a thermal plume is created that spoils the image at high magnification. This happens from set up until the whole scope cools. HOWEVER, if you insulate the OTA the tube does not cool quickly so no heat differential is allowed to develop and so no heat plume is created meaning you can rip high magnification straight away from set-up without any heat related distortions.
I have been insulating my Maks and SCTs for several years. While there are no off the shelf insulating wraps to buy, the good thing is you can use just about any material to make these. I have used yoga mats and sheets of Corflute. While I sold my original SCT years ago, I had another C5 for a short time recently and I also made an insulating wrap for it with Coreflute - see the pic below. Design your wrap appropriately and you can also have it double up as a dewshield. I've also added a pic of the orange tube SCT I had with its yoga mat wrap, and of the 127mm Mak I now have with the wrap also made of Coreflute. Another popular material that is used is called "Reflectix". You wil find plenty of info on insulating SCT's and Maks in the Cats and Casses forum.