@BFinkelstein I'm having the exact same behavior but this didn't resolve it. Everything is still speedtesting at about 600 down and 800-900 up. I was so excited to have found a solution too, but it...

I've been using a C4000XG Greenwave router which comes with new Quantum fiber installations which gave me advertised speeds of 940/940 while on ethernet, but it has always been a nightmare with WiFi....