There's no crying in baseball, and there are no shortcuts in audio. I think you have a good handle on this already. Placement is key and it is trial and error. My speakers are set up asymmetrically, with one speaker about an inch farther into the room, and my chair is also skooshed over a bit to that side, all because of an asymmetrical room that prevents identical distances to the sidewalls. Thiels are also known to have small sweet spots, a fact usually attributed to the steep-slope crossovers used in all their designs. Tweaks to affect this (perhaps only marginally) would include the Argent Room Lens, the ASC Studio Trap and the Totem beak, which was just reviewed on this site.
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