I just bought a Wolfe spring kit for my SP101. I'll post the results when I get them installed. I'll probably start with just the mainspring and see how it feels. The stock spring is 14 lbs and the kit comes with one/ea in 9, 10, and 12 with a trigger return spring of 8 lbs.
The guys to ask on Ruger triggers is probably Mr. Bane, the Hazcat or several others on the board.