With the Celestron alignment routine they don't really mention it anywhere but for your 3 stars you should be following the triangle method;
Star 1 - Should be mid height somewhere in the south-eastern sky
Star 2 - Should be mid height somewhere in the northern sky
Star 3 - Should be mid height somewhere in the south-western sky
You will effectively have drawn a triangle around yourself giving the mount the best possible solution. Don't have the stars too close to the meridian and don't bother with anything near the SCP as the northern-hemisphere programmers don't like us much.
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