Speed/downstream issues (Gig service w/ SB8200)

This week I moved from an Arris SB6190 to a SB8200 modem due to upgrading to gig service. The modem was purchased new and was confirmed supported by Comcast. The main Comcast line to the house is directly connected to the line inside the house - no multiple-way splitters are in use.

While my upload speed has improved, my download hasn't changed and is ridiculously slow. I might hit ~500 Mbps down for a second and then it’ll stay around ~190 Mbps. I’ve factory reset and power cycled the modem. I’ve asked Comcast to re-provision the modem and I confirmed with them that they programmed it correctly from their end.

I performed the attached speed test by directly connecting my laptop, with a gig port, to the SB8200. I've also attached pictures of the stats of my modem along with downstream and upstream values.

I've called Comcast numerous times and all they want to do is reset the modem remotely.

Any idea what the heck is going on?