@RJohnson 

The Ethernet port on the RE650 is not for a wired backhaul.  It servers two purposes:  1.  to allow physical connection of client devices while in RE mode.  2.  A connection point to the router in AP mode.  

By the way you describe the use you have the Device in AP mode and that would make sense they they should up as different devices because the are different APs, essentially spliting the network map.  

K, any ideas for a better network map view of all connected devices? The current view is only 6 items tall using web interface. A full map view containing a renamable device name field, ip, MAC address etc.

@RJohnson 

Viewing the map from the AX6000 should show all devices on the nework 

@RJohnson 

I guess what you need is the future-promised OneMesh availability on both router and repeater. Once OneMesh is enabled, it is supposed to work together as a Mesh network and you will be able to manage everything from the router and the RE650 will only serve as a network extender with roaming capabilities so seemless connection will be enabled. Or at least that is what I understood you needed...