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The amount of light pollution has no effect on the sharpness of the telescope. Light pollution just makes it harder to see dim deep space objects, especially galaxies.
The sharpness of your scope depends on the quality of the optics, collimation of the mirrors, and having the scope fully cooled to ambient temperature(which can take some hours). Once those factors are under contol, the stability of the atmosphere will determine what magnification you can go up to while still having a sharp image. By using your ed80 frequently you'll get an idea of the level of magnification you can typically expect to get in your area.
If the stars are twinkling crazily you'll be stuck at low magnification (say 60X). If the stars look very steady you'll probably be able to go to higher magnifications. Regardless of all this, a larger aperture will let you see DSO's better.
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