I have been shooting 1911's for many years and have always been told that "0" over-travail was best and always set my triggers that way. I read something the other day that changed my mind about the over-travail on my rifle triggers. "You want over-travel in your rifle trigger because you don't want the trigger contacting anything once it brakes until after the bullet leaves the barrel." Seems to make sense.
Guns are not dangerous! People are! RKBA!