I always consider solid shooting to be 1" for every 10 yards of distance. That group looks like 3" at 30 yards. So, like everyone else, I'm thinking your'e trying to fix something that ain't broke. Still, the shot that goes left in the horizontal line may be a slight hand torque issue. I know my "fliers" tend to be low and a little left.

There is some stuff in Easton's tuning guide about tuning groups. You might download this valuable little brochure.