Thanks. I was considering buying a 113mm BB and move the ring to the inside to get perfect 42mm chainline, but as you say, why spend the extra money if it runs smooth enough.
And I don't skid or do heavy backpedaling (to save my skateboard-beaten knees), so that reduces the risk of chain throw too.
Though it still puzzles me how others can get a good chainline with the same BB/crank combo...