Any switches between your router and tv on your local network?
DNS servers by default are Google 8.8.8.8 and Opendns? 8.8.4.4
Tested my download online with updates or installing games via Steam and that uses the full speed of my connection.
Instead of using traceRT try pathping. It will give you latency and packet loss per hop.
Steam is multi-threaded. Try the Thinkbroadband speed test during peak hours, it'll show single-thread performance.
http://www.thinkbroadband.com/speedtest.html
a lot lower on there than speedtest usually shows, wonder if thats the problem speed isn't actually what speedtest comes back with even though the routers sync'd at 70mbps.