With lighter springs, you run the risk of misfire. Lighter springs reduce the weight of pull of the action (as well as hammer drop strength) they don't make a guns action smoother, and smoother is the key to D/A shooting (within reason). Have a good smith do a basic action job. That, along with well fit grips will give you a good platform. I used to have a Smith 36 that had a notchy action, and try as I might, I could never shoot it well D/A. Sent it out to the Cylinder and Slide Shop, and it came back smooth as could be. Then I could shoot that gun almost as well as my Smith K and L frames.
Larry