Those pathpings look pretty normal too. Unless there servers were 100% down at that time, thats probably ICMP deprioritization, which is normal at the last hop of Coxs.
One thing I have noticed on the forums is lots of people asking abour the PS4 and the included twitch streaming. Did your problem happen around the time the PS4 got popular? I wonder if its a issue with their servers, or atleast their ISP/Peer or something.
Maybe try this? If this works, atleast we know the problem, low throughput. Also maybe try this? Mostly used for download problems, but the VPN should work both ways, so if throughput is good, but routing is bad, VPN should show us.
Also, have you checked your settings with your streamer, are you using Xplit?