Does such a cable exist- sweet, lush, detailed & dynamic?

These original AZ Matrix Refs will do that, and yes I own them (these are not mine BTW). 

https://www.usaudiomart.com/details/650268493-acoustic-zen-matrix-reference-rca-cable-1-meter/

You forgot to mention 5) ”affordable”

Your wishlist seems like a component change vs a cable 

Awesome system @zavato ! Congrats. 
 

I used to have Pass X250.5, then XA30.8 and X260.8. Preamps were XP-12 and XP22. I also owned Bricasti M3. So somewhat familiar with what you’re experiencing sound wise. 
Getting back to your question - I see you are using Ohno Continuous Cast (OCC) Copper cables Interconnects and speaker cables. I assume these are Audience cables?

I’ve not had good luck with these. I owned Ohno RCA and XLR cables. I think you can do much better. And not at much higher price. I’d focus on speaker cables first. I really like Audience FrontRow but before the FR I had the AU24SX and they were awesome. Not as extended and refined as the FR but not too far behind. 

I use Nordost Tyr 2 interconnects and it’s a nice balance with the Audience sp cables. This combo should work great with Pass gear.