How would you spend my next $5K?

Extra S/812 sub and some bass traps. After that, change out all your Transparent cables. They all add to muddiness of the bass. No bass detail albeit they add some airiness to the upper registers since they pressurize the room with their boominess. I’ve been extremely disappointed with Transparents. Most cables at 1/4-1/6 the price are much better.

I would do number 6 or 7 if u was in your shoes.

More music. You have arrived after moving everything away from the speakers, Great system by the way! 

I read a bit of this thread. One can have the best system. Though without proper acoustical set up. You are not optimizing your systems full potential. 
 

Yes. A new power cord or new speakers are fun. Though proper treatment of your room will make all extremely cohesive. 
 

best luck 

Thanks for the thoughtful input.  Here are the responses to how you would spend my next $5K.  Seems a clear consensus between room acoustics and second sub.  Special kudos to those who said they would spend my $5K on their system. lol 

Second sub - 11

Room acoustics- 14

Super tweeter- 2

Cables/power - 3