I attached an ethernet cable from my mesh router satellite to my Node 130, and didn't hear any difference from my wi-fi, which was usually excellent in strength.
What did make a significant difference was adding a Teddy Pardo linear power supply to the Node. Unless you're in a really noisy wi-fi environment, I doubt that all the other changes are worthwhile.
One of the good things about the Blusound software is that you can monitor the strength of the wi-fi signal that gets to your Node.

