Wired Backhaul Dasiy Chain - Orbi 850

Hello,

I am trying to cover an area around 10K sqft - which I am using 1 router and 4 satellites. 

Backhaul connection is good and the coverage is nice. However I have  2 problems:

1- All the satellites are wired backhauled (3 of them are connected directly to the router, 1 of them connected to a satellite) 

However the satellite-4 that is hardwired to satellite-3 is showing to be connected to the router with WIFI backhaul. 

Router is a little bit far away and it impacts the speed that we are getting for sattelite-4 

2- Going around the house, in some places my phone drops the wifi and is not picking up automatically. Even though automatic connection is enabled. I believe it has trouble switching to a specific satellite. 

Do you have any suggestions how to get satellite-4 to use backhaul connection to satellite-3 instead of wifi backhaul to router, which causes all the problems I believe.

Thanks,