I got the 66-8 back from the gunsmith a week ago and am very happy with the results. My instructions were to true any mechanical or timing issues and smooth the DA trigger not lighten it with different springs. He doesn't believe in light springs so we were on the same page with that. When he called to tell me my gun was done , he said the mechanicals and timing were spot on as received and polishing of contact surfaces was all that needed done. He even polished the trigger lever and its socket in the rebound slide. The results are excellent. The DA trigger is glass smooth and feels very good. It even feels lighter.
Once in a great while , we come across a gun that is exactly what you want. The 66-8 with the trigger work and the other few changes I've made is , in my mind , the perfect fighting revolver for me.