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1. Sounds like you will have to judge how much it will move when you tighten it and allow for it.
2. Could be lots of reasons, poor alignment always causes issues around the poles, when you calibrate phd you need to pay attention to which side of the meridian you are, when you flip you need to recalibrate. 1-2 secs would be the most common guide time so no big issues there. You also need to check where you calibrate phd it needs to be at right angles to the pole... Without getting technical, do it at the pole and it will fail in one direction and switch that component off.
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