I don't think you should blend MoCA and Ethernet mode at the same time.  Should be one or the other.  When I had four HWSs and one Joey I had all five units each connected by Ethernet cable to my router and they worked great in Ethernet mode.  For my two Hopper 3s and two 4K Joeys I have everything in MoCA mode.  I notice no difference in performance for either MoCA or Ethernet mode.  USB ports are used for EHDs and the OTA adapter is all I know of.