Not Getting Full Upload Speed

I'm not sure what to do, I just signed up with Xfinity for the 1GB plan after entering my home address - I really was thrilled to see they had a plan that fit my needs really well. However, now that I've had it for a few days, I'm seeing issue, and experiencing disapointment. This is the speedtest I just ran. I'm fine with that download speed, but I'm absolutely displeased with the upload speed.

I had originally purchased my own modem and my own router. I also verified through XFinity that the modem I selected can handle the speeds I'm paying for. The modem is the Netgear Nighthawk CM2050V for reference. What am I doing wrong? The chat agent had me drive to an XFinity store to get their branded modem. I'm getting identical results unfortunately with the XFinity modem.