weakest link? what would you upgrade?

The big question is "where does it hurt"? Obviously you are experiencing displeasure or you wouldn't be here looking in to options of change. Does the sound come off hard? You mention leather furniture and commercial carpet.
These combined can create a type of echo for lack of a better word. Maybe room acoustics are a direction to go.
I am shooting in the dark here.

Not really dissatisfied, i was just looking for opinions. but then again i don't know what would make a large enough difference to make the change, so i ask the question.

I understand, as we all seem to want changes in our system from time to time when many would kill to have what we have. You have a good system equipment wise, maybe cables would create a differents sound that brings a fresh and new excitement. From I read I think you are in a "tweeking" mood and just need to decide where to start.
All just my opinion as I am kinda where you are but unable to move due to budget.

If this is a dedicated game/ ht room then you should look into room treatment. Some bass traps and sound diffuser panels or perhaps adding another one or two subs would be great for HT.

Doing the research on the acoustic panels now.... thanks

I don't really understand. You seem to like your current set up. Why change?

Maybe i am missing something and do not know about it, i do not know what changes would make a significant impact. so i was looking for ideas.