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Matty, don't worry about which direction the star drifts in Azimuth. The aim is to stop the drift correct? So when you put a star on the cross hair, watch it drift, then crank your Azimuth adjuster at least half a dozen full turns. Then recenter a star and watch again, if the star drifts much more slowly then you've gone the right way, if it drifts the other way you've gone too far. Either way you now know which way you haver to turn your adjuster.
If on the other hand your star drift is faster then you know you've gone the wrong way.
Now on some occasions I've not seen any change in the rate of drift, which means I'm waaay out. In this case I will actually pick up the two back legs of the tripod and move the tripod one way or another about 150mm and start again and repeat the process.
It sounds really rough, and it is, but you would be surprised how quick you can get with it. Plus you don't have to worry about which way us north or south or up or down or to turn left or right. In fact you can use this technique to determine if you drift one way which way to you turn your Azimuth adjustment for you scope. (remember it will be different with and without a diagonal).
To finish off I use K3CCDTools to fine tune.
BTW When you move the legs make sure you recenter your Azimuth adjustment before moving the legs.
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