Can't advise anyone who to use in Dallas anymore, but the guy that did my pin barrel M60 Smith back when it was new'ish put about 6-7 hours of stone work in it, and trimmed the spring about 2-2 1/2 curls as I recall. It's never had a misfire. It has about a 19-20oz SA letoff and a little over 2 lbs DA letoff, with a nice "hesitation" position in DA I can feel and hold at before the super crisp letoff. The trigger is smooth enough that I can shoot DA rapid fire and the barrel never wobbles as it cycles the cylinder.
The work was done in Gilmer, by the store mgr of Dale's Gunshop that was owned by the Head Deputy and later Sheriff of Upshur County. I cannot imagine what this same kind of work would cost today, on an hourly gunsmith rate. This'un 'ill go in the box with me when it's my time.
Remember Aesops Fables of the "Scorpion & and the Frog's" crossing the river...
... we must hang together, or we will ALL hang seperately, Ben Franklin..
Those who fail to learn from History are doomed to repeat it,Santayana