"looking at the upstairs system, this question is more for my downstairs."
Yes, now I see. Didn't display 1 look.
I'd fine tune room 1st.
Those little black thingies probably aren't doing anything.
Side walls/ceiling could be addressed for diffusion/damping issues and as mentioned-loose the table.
Multiple subs needed for real low end performance.
All that for serious audiophool fun.
If you're gonna drop some serious cash with only reading reviews/forums, then buy from ae legit stablisment with a return policy, and don't complain about a restock/shipping charges.