comcast doesn't lock channel 32. It leaves that for the ofdma link.
How are you testing speeds on the CAX?
What device?
What site are you using for testing?
Keep in mind, the only way you'll see over 1 gig speeds is if your pc is hardwired into the 2.5gig port and has at least a 2.5gig connection (the pc). Then test on comcasts speedtest site.
the built in speedtest site isn't accurate at greater than 500mbps speeds.
