"940/940" Mbps FIber (CenturyLink).
The software upgrade this week (Nov 16) did nothing. Zero.
Right now I'm 80% leaning toward returning the set of 3. I do dislike Google's Store policies in general (they couldn't even properly figure out my sales tax in Colorado for a long time...total amateurs), so the short return window will force my hand.
Thanks for providing all the troubleshooting you've done so far. You're definitely an advanced user and I appreciate all the details provided. Can you tell me what speed test you're using? Are you measuring directly out of the Google Home app or by using another piece of software? Are you also able to check in the Home app to see what firmware version you're running on your router and points?