A simple question, do you open or close the door to the room? Do you open the doors to the closet?
Have you tried it with an open window? PORT the room.
Second have you tried without a sub? Maybe you don't need one OR you need to turn the crossover to the lowest position 30hz and turn it up until
your ears start bothering you. It sounds like a ported vs not ported ROOM, totally untreated? Open the window and door. Open the
closets too. Use them for traps. Treat the room THEN EQ until your hearts desire. Everything is backwards.
Position first and get off the back wall with the recliner (S). How about one recliner first.
The speakers need to come out into the room. They can't image very well in the corners and they will likely add to the sub/bass issue.
You may not like the side wall for a sub, but it may be closer in TIME and easier to integrate to the mains and center speaker. Tune the room
first not after the fact. Curtains and tuned traps are out I suppose? Just askin'