+1
Exactly. I have to say the same stuff... hopefully differently. 1) is the big problem. The second is reducing the fidelity.
1) There are two ways to do streaming with your Streamer / DAC. One is to "catch" the streaming service on your phone and then to send it to your DAC by some terrible sounding method like bluetooth. This is the wrong and vastly inferior way to do it. You want to be using the Eversolo app to control your Z8. In the Eversolo app (for your phone), you log on to Qobuz or Tidal... Hmm, I missed it, what service are you using? You should use Qobuz or Tidal.
The give away is that there is a hookup problem is that you should not have a volume control on your phone in the loop.
2) Your Streamer / DAC budget consumer and you have high end Preamp, amp and speakers. This is a gross mismatch. You must choose wisely but and appropriate investment is that Streamer (individulal box)cost = DAC (cost) = Preamp = Amp. If this ratio is way out of whack then the sound quality you are getting is going to be very inferior. If you want you can get a Stream / DAC combo, but then it should be in the ballpark investment level of combined preamp and amp.