I found an article at http://www.speedguide.net/read_articles.php?id=1885, which suggested moving the router away from the modem, and that line noise can cause significant slowdowns. I didn’t really believe this would work, but I decided to try it.
So I moved everything apart from each other. I moved my router up to the highest level I could, tucked away between some floorboards on the level above. I then moved my cable modem 2-levels down, also tucked between 2 wall joints. I then moved my VOIP box away from all the rest. I went and tested the speakeasy.net connection on Broadband Reports. What do you know? All the sudden I was showing 6.6 Mb/s down with 360 Mb/s up! I now officially get more than I’m paying for!