I've also noticed that the switch SQ kept improving over about a two-week period until finally reaching its peak. Even without the new NIC card, the switch and DAC cable make a nice improvement in SQ. Overall things sound more analog like. The sound is fuller and has more life to it, leading and trailing edges are getting closer to pure analog. At this level, to me the biggest sign that things have improved is that I am listening to and enjoying more music than ever. I look forward to what the new NIC card will bring.
For anyone who thinks it is strange that I mention the sound of analog even though I have no analog front end equipment listed in my signature.
I spent decades making my living aligning, repairing and modifying multitrack analog tape machines. As much as I like analog, I will be happy to never touch a reel of tape again. For me it's too much like work. Digital of this quality is too close now to sweat the difference anyway.