Got the 3 set of deco x4300 pros 

main deco is connected to router that's in bridge mode. 
 

that deco is connected via Ethernet to deco #3. 
 

deco # 3 is connected to deco #2 via Ethernet. 
 

i get 900+ mbs on deco 1 and 3. 
 

deco 2 starts off at 50 then immediate drops below 1, every time. 
 

I've changed the Ethernet cord, I've changed which port it's using, and I've even tried connected 1 to 2 instead of 3 to 2. No matter what I do, this decos speeds are horrendous. 
 

can't select model in the form above because your website is as broken as your hardware. Had to paste it in. 
 

The WiFi mesh is awful. Phones don't switch as I'm walking through the house at all. do I just need to give up on deco?