Sorry it didnt work for you, though it has for a bunch of guys, and you did learn it wasnt the way to go for you and cost you nothing. I cant help but wonder if you had/have tried the subtle bending of both spring legs to improve the spring tension while maintaining both legs? It isnt hard and if I can remember the link I'll post it (was great pics or video). When I tried the drop of one leg I took some care in looking at the mechanism to try to perch the off leg out of the way of the mainspring and strut. Right away I liked the direction this was taking me so I fairly quickly (within 50 rds) went on to tweak the spring. Worst case scenario for me was that I'd mess the spring up and need to get a Wolff replacement, but hey, worth a go, no?
It works great, cost -0-, and I learned I could tweak a Ruger spring with success. All + in my book.
Could it be that your well worn S-Six has a lighter spring already in it or that it is now somewhat weaker with age so that the one leg on wasnt returning the trigger with enough oomph to keep it from catching as you cocked the hammer?
As for a gunsmith triggerjob and new spring install hereabouts, the better part of $100 is more than 'not much $' and a bunch of 'gunsmiths' are not single action educated anymore. This is to say, for me, if Im going to have to pay someone to work on one of my anything he is going to be a specialist in that type; I dont likely want a 'blackgun guy/Ruger 10/22/parts swapper' working on mine.