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I was told by Steve Massey the trick with 2-star Vs 3-star is this.
2-star: align on 2 stars the same side of the meridian, more than 3 hours apart in RA and greater than 3 degrees apart in Dec.
3-star: same as above, but the 3rd star on the opposite side of the meridian with a difference in Dec to the first 2 alignment stars of 30-70 degrees.
I mostly use 2-star and it seems to work OK... although the accuracy falls away a little when you cross to the opposite side of the sky. 3-star doesn't seem to help this much.
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