Speed not faster after upgrade

I upgraded my Xfinity to 800MG down tier. I've rebooted everything and followed various instructions with the chat bot. But nothing seems to improve it. 

I received an email today that says "You recently upgraded your Xfinity Internet speed, and as a result, your internet equipment can't keep up with the latest speeds available to you."

When I check the Xfinity compatibility list, my modem is listed as compatible for my speed level.  I have a Motorola MB8600 | Model number: MB8600. It is listed as up to 949 down, but I'm only getting 90 down. This is the same speed before I "upgraded".

The coax is only a year old and still looks great.

Any ideas of where else to look or what to check? I've hit a dead end. 

Thx