I have a new Hitron CODA56 modem and am only getting 50 mbps upload

I recently activated a new (customer owned) Hitron CODA56 modem on my Xfinity "next gen" service (1GBps DL/100mbps upload).  The router was activated and provisioned successfully and my upload speeds did increase to 50mbps from ~40mbps previously, but not the full speed I am expecting for this service. The Next Gen service is available in my area.  My research leads me to believe that my router hasn't been provisioned with the correct upload profile.

Is someone able to assist? I tried the AI assistant but was unable to get any success.