I installed a Wolff kit in my SP101 years ago, both the reduced power trigger return spring and the 9 lb hammer spring. No issues with light hammer strikes.
I've had my SP101 since the mid 90s, so lots of dry firing plus the Wolff springs made a good package.
I only own three revolvers, an early 80s Dan Wesson 715, S&W 64-3, and the SP101, so comparisons are limited, but when looking at both single and double action the little Ruger has the best combination. The DW has the best single action trigger, the S&W has best (by a small margin) double action trigger, while the Ruger is now second best in both single and double action feel in my hands.
My opinions on trigger feel are somewhat subjective, and not just about pull weight (which I've never actually measured with scale, just go by relative comparison b/w the revolvers). I also consider smoothness, crispness, overtravel, stacking, and ability to stage. For example, I consider the Dan Wesson double action as the worst even though it is light and smooth, but is just about impossible to stage. I consider the 64-3 single action the worst because of overtravel.
