Solved! Go to Solution.
To add to Rich's comment, one of our forum members has created a great troubleshooting guide located here:
It is a reference for optimal signals. As it notes, there are upstream SNR and ICFR levels that are not available to the customer. When you call support, maybe mention these levels. Representatives will have a way to read them & confirm they are in spec.
Hitting 27 Mbps down / 11 Mbps up now.
Austin (spelling?) from Comcast Business Support was super helpful. She walked through an entire suite of steps after I provided her some extensive troubleshooting and tehnical information. Turned out to be a misconfigured NIC.
Thanks for pointing me in the right direction folks.