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Alasdair,
First question. Have you aligned the finder to center of the view in the main scope using a distant object? tree or light pole etc?
At zenith it will be a little difficult and a right-angled finder is handy, however I wouldn't be rushing out to change it over unless you have the budget. GSO ones from Bintel are $89.
You may find that adding a telrad or rigel quickfinder down the track will make it easier to aim, however you can also aim by looking down the barrel of the scope and using one of the finder alignment knobs as a reference.
Zenith is difficult still, perhaps putting in your lowest powered eyepiece and zigzag slowly across the sky. You will learn such a technique for searching the sky as you observe more and more. I'd suggest when you do get a good night to cruise the sky with the low power eyepiece for starters.
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