Vader is asymmetrical in every movie apart ROTS. Its common that you cant achieve symmetry with non computer sculpting. thats the beauty and the set back at the same time.
Other plans are removing the useless guards inside the the conference room.
Unless they are floor managers that drag the dead bodies it have no purpose being there.
Further ideas: when Luke han and chewie are on the elevators , in the far shot( the one with the matte) if you think the layout a bit you will notice that the big hole at the right with the half extended bridges makes no sense.
So removing the doors/bridges whatever and adding a ROTJ or TMP reactor like pole in the midde. meaning that we have to expand the shot to the right and pan it back to our heroes. Subtle changes will not affect the lightning settings(maybe a slow flickering just for the sake of it). The station needs more powerful shots and more industrial look.
Working with large scales with small rooms it brakes the illusion of vastness but tho it creates claustrophobic results. Well you have to sacrifice some to gain some others.
-Berry and Blue