I need help with my Moca setup1

Hey guys. I'm not an expert in network but I'm having troubles with my Moca setup. I successfully connected everything, and my PC has internet via ethernet, but I definitely have packet loss and weird spikes of high ping.

This is the adapter I currently have: Amazon.com: Hitron Bonded MoCA 2.5 Adapter (2-Pack) | 1 Gbps Ethernet, 2.5 Gbps Over existing Coax Cable | Ideal Backbone for Mesh WiFi, Streaming and Gaming | 2 HTEM4 Adapters in Kit : Electronics

Ground floor:

Coax Point of Entry -> Xfinity router -> ethernet -> adapter -> coax to wall

First floor:

Coax from wall -> adapter -> ethernet -> PC

I'm not sure if this is correct but this is a rental and went they built it they setup a coax cable from one floor to another instead of ethernet cables.