RBKE963 LAN Ports seem to be bottle necked at the Router

Thank you for the prompt response FURRYe38,

Just when I thought I was being thorough, you point out some pretty obvious information I should have included. My apologies for not including...

- Gateway is in Bridge Mode, which I had done prior to install of the mesh. I wanted the Orbi to do all the network routing, and I didn't want a double NAT issue.

- Armor, Smart Parental Controls/Circle, and Traffic Meter have all been disabled since the point of install.

Response to your suggestions:

- I will absolutely switch to CAT6a STP if needed, but a 3' CAT6 patch should be able to handle 1.5 Gig with ease, no? I'm using an Atolla USB-C to Ethernet adapter (C105) capable of 1 Gig, so I would expect close to a 1 Gig when testing... or am I mistaken?!

- I do have a windows laptop I can conduct a similar test with, so I will try that as well. 

- The FW issue is very interesting to me, because when I search for updates via the app, it tells me its up to date: 

However, I can clearly see that there is another FW update available via the link you sent me. I will look to see if I can manually update the FW and report back. Thank you for that information and links!