Hi Gammajo,
The speaker was on the short wall and now it sits on the long wall, 6.5 feet apart and 3.75 feet from the back wall.
The key is the side walls are now 5 feet from each speaker and my listening chair sits in a 18 ft cavity which is 5.8 feet in width. By cavity I mean a walk thru from the basement stairs to the listening room. I sit right at the entrance between both spaces.
If you do the math you can see that by moving my listening chair I expanded the room by incorporating the 18 feet additional space with additional acoustical treatment courtesy of the drop ceiling in that space.
The speaker is by Argent Audio called the "Gabrielle". It was designed by Ric Cummings, the original inventor of the Room Lens.
Worth the time and effort indeed.