For performance only, I use the wolff spring kit with the reduced power mainspring and a lighter rebound spring.
For a use that includes protection, I only use Wolff standard power mainsprings or better yet, leave it as factory and shoot it smooth.
A very good action lub, properly applied, can also help in many cases.
Important:
Never grind or change the sear notch, etc. Doing so will allow the hammer to drop if the hammer is hit, gun dropped, or even if the hammer is pushed on (in really extream cases).
JMHO, even the polishing of anything in the sear area should be done by a good gunsmith.