I have been studying streaming relentlessly for over 2 yrs. I knew nothing. So this what I would recommend before you spend lots of money.
1. Ethernet cable from router to streamer.
2. You can add a network switch to help clean up any noise
3. You can add an ENO to your ethernet line. About 700 dollars.
4. Good power cord to DAC and streamer
My opinion is you have very very nice equipment. I would optimize what you have before I tear it apart and start over. All these tweaks clean up noise of different types. All the above can be done for 2000 or less. You might be surprised.