Modem Provisioned speed

Hi,

I'm on the 1.2GB Speed tier.   I have a Arris S33 cable modem with a 2.5gb port.  I have that connected with a very short CAT6 cable to an Asus RT-AX86u router with a 2.5GB WAN port.   The router has it's own speed test utility that uses Okta speed test.  Other people with this same config, are able to test using the router speed test and see 1.2GB or higher speeds.

I'm not seeing speed tests above 950-980GB.    I'm guessing it's own of few possibilities.  

1. The provisioning file for the cable modem isn't correct.  I doubt this would happen.  I switched from 800Mbps to 1.2GB a few weeks ago.  I did notice the upload speed go up, but the download speed didn't really change.  Is there any way to check the cable modem provisioned speed?  If I go into MyXfinity I do see the 1200Mbps speed, as what is on my account.
2. I'm in a rural-ish area, and none of the sites that I am testing against actually have the capability of going past 1GB.

Any suggestions... I know it's nitpicky, but I wanted to see if I could really see any faster speed than 1GB.