Seems Kingwood is still nice and slow. In town visiting for the week, and can barely stream over Plex from my other connection. Recently, I upgraded my parents to a 6120 and is bonding all 4 channels. Before that on the D2 modem, the internet was unusable during primetime.
Anyways, here are some tests, check out the ping to the HOUSTON Comcast server from Kingwood(~25 miles, and yes, I know, it can travel across the country on various networks before getting there). This connection can't even carry Google Voice.
100ms to Dallas:
Better Ping, worse speed:
150+ to Austin:
Modem stats, my guess is these 4 channels are spread over multiple nodes instead of doing it the correct way and wiring 4 channels for each node: