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The other thing to remember when looking at deep sky objects, especially galaxies, is not to look directly at them. When you look directly at something, you use a part of your retina which has only cone type photoreceptors which need high light levels and which code for colour. The more sensitive rod type photoreceptors are distributed away from the fovea (the centre of your visual filed). They don't encode colour, so you will only see in shades of grey. So to see galaxies, point your scope at where you think they will be, but rove your eyes around the field and pay attention to what may pop up away from the centre of your gaze. You may find that if you look directly at a galaxy, it simply disappears (even fairly bright ones).
Of course dark skies are of great importance - I wouldn't be expecting too much in an urban environment. But even living in a perfect spot for dark skies, if I look directly at a galaxy or planetary nebula, it will disappear.
Good luck
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