Random high latency spikes

I am in CT and since Tuesday morning I receive high latency spikes from most websites and servers I go to - from Facebook and Google to gaming servers and even VPN for work (which my office also has Cox). I had a tech come out yesterday and inspect my lines - he said they were perfect (my house is only 6 years old and the drop from the box to my house was installed just a few months ago).

When I called Tier 2 again I had to give them 3 sets of pings and traceroutes; I provided Google, Facebook, and io9.com. The person I talked to sent them somewhere (network engineers, maybe?) and called back 10 minutes later saying it wasn't anything happening in the Cox network, that my ping and traceroute packets are being deprioritized after the Cox network. I'd agree with this if it was just the three sites that I provided the data for, but when it's every single site I visit - again, websites, gaming servers, servers at work through a VPN tunnel, I highly question whether all of those servers will be deprioritizing my network traffic (and why would they deprioritize non ping/traceroute packets?).

I'm extremely frustrated since this makes working extremely difficult. Of course Cox engineers are going to say it's not them. When I VPN into a machine at my office and perform the same traceroutes/pings I don't get the high latency spikes that I'm experiencing from home.

What are my options? Should I continue to call Tier 2 and demand a better explanation as to why all of my traffic is "being deprioritized"?