Another thing to consider if you’re using the DAC in the Node would be to upgrade your DAC and digital cable. The newer R2R DACs tend to have a more natural and organic sound that may yield the improvements you’re looking for. Here’s a nice review of the Musician Pegasus ( $1100 that I own) just to give you an idea of the sound characteristics…
https://soundnews.net/sources/dacs/musician-audio-pegasus-r2r-dac-review/
If you can spend a bit more the new Gustard R26 is likely a nice step up in sound (you can read the review on the same site as above). Either way, I’d recommend springing for a used Acoustic Zen MC2 digital cable ($660 new, $275 used) that I just got and it’s an excellent cable with a great sense of naturalness while maintaining great detail and was a huge improvement over my budget cable…
https://www.usaudiomart.com/details/649951192-acoustic-zen-mc2-digital-coax-cable-1m/
I also don’t think the Zu option is bad either, especially if you can demo them at home, but just wanted to throw out another option for you to ponder. Hope this helps, and best of luck!