The 640 and 642 triggers often break at about 12 or 13, so it's not unusual for shooters unused to these snubbies to find the heavier trigger pull extreme. Still, if the trigger is smooth, the pull weight is almost secondary. Before thinking trigger job, just open her up and clean it out. Check for burrs or metal filings. Lightly polish contact points. Some dry lube may be helpful -- just a bit. It might feel a lot better.