After putting the 396A tube back in and having mixed emotions about the results, I talked myself into taking a different approach all together and scratching another audiophile itch.
I've purchased a used Denafrips Ares II DAC that I hope will be a clear upgrade for my system. I did some reading to reinforce my expectation bias, so I've done what I can!
The Maverick Audio TubeMagic D2 DAC is clearly an entry level product (<$250) and marketed as a desktop DAC. With the Sparkos Labs op amps I believe that it outperforms it price point, but anticipate that the Denafrips will be a step up.