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The two stars it picks could be part of the problem. I found that when I used both Sirius and Canopus in Alt Az mode that the separation between the stars is not far enough apart. Certainly use as your first star then select another star much further away. This will give your scope much greater angular separation and therefore more accuracy with the calculation for setup.
What surface are you setting up on? Like I said grass can be a problem.
Just remember in terms of what you can see in the city, faint objects will be harder to see. A good example for my scope is centaurus A. A side on galaxy is very very faint in my 10" scope. Using averted vision helps a lot and detail can be seen, but your eyes have to be adjusted. Try for Eta Carina, the dust lanes are easily seen and your scope will pick it up. Orion's nebula is also a good one to see. As is the sculptor galaxy (not available for a couple of months). Just remember that you don't have a 18" scope and somethings will not be seen easily.
Anyway tell me more?
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