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Many mounts actually track better out of balance, as it can be used to keep gear systems meshed. Even in belt drive systems, if the ring and worm gear are still used a bit of unbalance can keep lash down.
On my 10" imaging newt i don't worry too much about the camera and filter wheel and coma corrector hanging off the focuser, i just balance the tube on DEC to be slightly rear heavy ( which works best on my mount), and east heavy ( which is focuser side anyway) on RA but not much. This seems to work in my situation. On my Mak-newt i have tube rotated in its rings to put the camera as near to the top as i can without blocking the guide scope. Its always best to stay under the rated imaging capacity of your mount, where weight and its placement is less an issue.
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