@troutstreamnm SQ is very good in all these setups (including yours), see my original post. We’re just trying to figure out what’s better, which is possibly a crazy exercise, but it’s fun.
On that note, @sns I’ve also tried different alternatives with fiber, including the Optical Module and Optical Rendu combo you mention. For me, a Netgear unmanaged switch with SFP worked just as well as the OM at the start of the fiber. No difference. At the other end, there was a significant positive difference (relative to the OM) when I used an Etherregen with fiber coming into the A-side and a very short ethernet cable to my streamer on the B-side. My transceivers are Finisar FTLF1318P3BTL. If I follow your advice on isolating the Eero mesh, I would like to get a router with SFP out and remove the existing Netgear switch so as to streamline the topology.
Here is the crazy thing though. I cannot find a router which (a) has no wifi, (b) has SFP, (c) has a 2.5gb port which I can use for the mesh and (d) can be run cool with a 12-15V DC power supply. The closest I can get is the MikroTik hEX S, but alas it doesn’t have a 2.5 gb LAN port.

