Hey Peter. I think I know where I may have gone wrong (haven't confirmed it yet though) I don't think I picked a star close enough to the equator when checking for drift? Will try again soon. And to answer Rob, I want to pretty close. I am just getting in to astrophotography, so I will use a piggyback system with my DSLR for now, maybe only a few minutes of exposure. But I would like to get into deep space imaging eventually. So I guess it will have to be spot on for that.
There is a website
http://www.petesastrophotography.com/ which has a drift alignment simulator. Tried that and seems pretty straight forward.
Will keep playing with it. I will let you know how I go!