Michael, since you're shooting DA then I'll suggest a spring kit and some polishing of internal parts. Also there are several DA techniques that will permit better DA sighting and control, mostly involving a partial-stop of the firing stroke just before discharge.
I've found that it's really helped me when I've shot at a distance over water where it was easy to see the bullet's strike for instant evaluation of the shot. I highly recommend this or something like it for about half your practice, the other half on paper. Just be sure of your backstop when firing over water of course.
Best, Joe
