I spent a good amount of time positioning the speakers in my dedicated room. I ran strips of masking tape on the floor at 1/3, 1/4, and 1/5 room width. Then perpendicular strips every six inches from the front wall. I tried 19 different positions, making note of the impact on sound at each position. Once I found a spot that sounded best, I adjusted toe to taste. I then dialed the position in with a laser measure. I now have the speakers positioned equally within an 1/8" in all directions. Oh, and the listening chair is precisely placed as well.
Small adjustments can result in a big difference.