BE27000 Mesh WiFi System (RBE973S) question on wired backhaul

I currently have the RBKE963, and am upgrading to RBE973S soon so have a question about the optimal setup for it.  I currently have the Orbi router 10GB port connected to the GS110MX switch 10 GB port, and use the 2nd 10 GB port on the switch to wire backhaul 1 satellite while the other satellite is wireless.  The ethernet cable I used was Monoprice Cat6A 500ft Blue CMR UL Bulk Cable, TAA, Shielded (F/UTP), Solid, 23AWG, 550MHz, 10G, Pure Bare Copper.  This setup has worked extremely well with wifi speeds over my plan.   

Is wired backhaul still theoretically better even on the RBE973S?  I have to go into the attic again and have a lot of cable left so was thinking of making one more run to satellite 2. I was thinking of upgrading the switch to XS508M since it has 8x10 GB ports, connect the router to it, then wire backhaul both satellites in order to accomplish full 10 GB wired backhaul connections. It's overkill now but im nerdy and like to think ahead. I'm not sure if that is the best way to do it with new technology on rbe973s, I know that was recommended on older models, but maybe things have changed. thanks.  Everything runs into a in wall on-Q 42" Plastic Enclosure in unused room.