You could put movable absorbers behind your head and in front of the sliding door behind your rack. You could also add double the width of the absorbers on the side walls to widen the sweet spot. Other potential locations to address are the wall/ceiling corners, and especially the upper tri corners. It looks like you're already well on your way to good acoustics. On a side note, you might want to move the TV so it isn't at a first reflection point. It probably offsets the help from the right 244 trap.
