I hope that you are using Shunyata NR power cables. These cables combined with an Everest 8000 made a dramatic difference for my system. I have Sigma to Everest and Sigma NR to 300 watt/channel integrated. Venom NR to subs, which only cover lowest octave. About to try Sigma NR upgrade from Alpha NR on phono stage, DAC and Aurender N20.
Roon has a better UI and I was running a 10th gen i7 NUC with Roon Core, but went with the Aurender N20. I’m waiting for Shunyata Sigma Ethernet and AES/EBU cables. Let me know if you want to upgrade Roon Core. I’ve heard great things about the Weiss. I found the Holo May DTE to be more musical than my MA12000.
It seems that you have made some good moves. Perhaps, Roon vs Aurender is more complicated on the musicality side of things and the devil is in the details, but Roon does have the better UI. I just moved to Conductor and it is better than I first thought. I believe that it would take a serious level of funding and great care in selecting components to rival what the N20 has…out of the box.