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You already have good suggestions for observing places but for those times you cannot get away and have to use the scope in the light pollution here are a few ways to improve the situation.
Flocking the tube and baffling the rear end to stop any light getting in from behind the mirror and a tube extension/dew shield that projects 1.5 time your mirror diameter in front of the focuser will help dramatically. This will go a long way to cutting down off axis light from getting into your light path and improve the contrast but the baffling will make it pretty important to have a fan for cooling your primary.
Another, often overlooked, consequence of light pollution is that you never really dark adapt. How to fix this is quite simple, use an eyepatch over your observing eye when not looking through the scope and fit an observing hood to your scope (some black cloth) and only take your eyepatch off when under the hood. This will let your observing eye fully dark adapt and take advantage of what light you have available.
Cheers
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