I have my Utopia since February of 2017 and despite multiple changes in my set up (like you I changed my computer + Audirvana plus for an Aurender N100H with great results) I never found them too hot. But I learned quickly in this hobby the importance of taking care of the power. Ultimately, the sound we are hearing as music is in fact electricity. So around 2014, on the recommendation of a canadian cable maker (Steven Huang of Audio Sensibility), I have decided to try an upgrade power outlet, a Furutech GTX-D gold. The improvment was immediate and not subtle in comparison of the Hubbel hospital grade I had. Gone the fatiguing ringing and welcome much lower noise floor, calmer and tighter sound. Then shortly after I bought the matching steel wall plate and carbon fiber cover. Not cheap but same kind of improvments. The vibrations of electricity reduced to a minimum. That is the trick. Later on along the way, I bought another Furutech GTX-D but in Rhodium platting. Much different sound than gold but still with the benefits of a much lower noise floor and absence of ringing. Gold and Rhodium have each their advantages and disadvantages sonically in comparison of each other. Gold is warmer and more organic with fuller bass and midrange but is slower and much less airier and detailed than Rhodium.
I wish that I can combine the best attributes of both. That’s where arrived the new Furutech GTX-D NCF Rhodium. Steven Huang told me that I absolutely have to try the new NCF formula. The praises and reviews from users were starting to show on different forums and I ordered one. Wow! Clarity, air, speed of Rhodium but with the organic and fuller sound of gold. Best of both worlds. A significantely better outlet brand new but much better after long burn in. I now have two NCF outlets out of my walls in one in my power distribution box. I can’t encouraged you enough to try them and look at reviews and comments on the web. If you go that route, go all in and buy the steel wall plate and NCF cover too. These make a diffrence in performance. I know it’s expensive but the end result on your system will most probably surprises you at a level you are not expecting.
On a final note, regarding tweaks, along with Synergistic Oranges fuses, I bought some Bybee IQSE to put inside components. It really help to clean the poiwer and found that I get results similar to changing the wall outlet but to a lesser and more variable degree depending on the component it’s put in and the set up. It’s an affordable way to help cleaning your power.