I have TP-Link Deco AX3000 WiFi 6 Mesh System (Deco X55 connected to a spectrum modem, i’m using my deco as router since my modem doesn’t have ip address or anyint it doesn’t even work unless my deco is in router mode. 

when i connect my ps5 via ethernet to this deco my ping is all over the place, how can i stabilize this ping how do i have to connect the deco to the router and how do i connect the pa5 to this deco to get a stable ping and a stable connection