raymo, the lower the better but if you can't get low down just lengthen the period of time you're slewing for. I usually start at 10 seconds and push it out to 30 seconds for final checks/adjustments. I mostly image with my 4" refractor though, so any drift will likely show up in your scope more obviously.
Like Ken says, if you don't adjust the altitude bolts in-between sessions, you should be pretty close the next time you setup, it'll mostly be azimuth.
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