I just found on this site, the return spring adjustment instructions.
I pushed the spring in a few times, and WOW, big difference on the weight of pull. Hopefully that will help a bit on the groupings.
I did the same thing on my Super Blackhawk, by droping one side of the return spring off the post. It gave it about the same pull as the Encore has now, and it groups VERY tight.
I am taking the Encore out West with me next week, and will spend some more time at the range with it, and try and connect on a few Yotes.........didn't pull a Bull tag this year for Oregon, but going along anyway.
Kevin