Looks like a nice place, nice equipment.
funny thing about pulling out off the back wall. the speakers bass will cancel a bit from 39” to 7.2’… so it will alway cancel at some frequency once you add wall,floor, ceiling bounce. Anyway from a pure technical standpoint 36” off the rear wall is a good place. It is far enough to improve soundstage but gets you out of the 60hz cancelation zone that is just a little farther out. Genelec has a good video about it. My solution is subs by the wall and speakers out into the room.