fluid inferno

Hi everyone, I've been doing a lot of research and spent a lot of time working with Netflix and TWC tier 3 support trying to figure out what is wrong. Basically, even though speed tests (speakeasy and speedtest.net) show expected bandwidth when I test (20 down 2 up) when I stream either Netflix or Vudu I can't get HD. I have gone so far as to disconnect my entire network and connect my PC (brand new) diectly to the modem and try to stream. TWC tier 3 support says everything looks good on their end. The tech even bumpted my up to 30 down and 5 up to see if that helped and I sitll wasn't able to stream HD. I also replaced my modem with a TWC unit just to make sure it wasn't my SurfBoard 6141. So it has become clear that the speedtests were only giving me a peak or avg measurment on a fairly small packet of data and that I needed to try a larger file download to try and see how the connection held up over time. I found testmy.net and started using their speedtest right away. Customized to 200MB download and 2MB upload and watched the Test in Progress (TiP) chart. As I feared the fast speed advertised and verified by TWC is only transient. Although the download speed spikes initially, you can see how the variance would be a problem for streaming. How do I go about getting TWC to address this? It seems this has gotten worse over the last month or so, as well, because we used to watch Netflix in HD a lot and it would usually work, now it almost never works. Netflix claims it is inconcievalbe that their Amazon cload servers could be slow due to traffic...at this point I'm taking their word for it. Does anyone have any explanation as to why I would see this kind of variance? TWC says their connection should be consistent but it clearly isn't. Any technical expertise or advise on how to proceed would be welcome. Thanks! Todd (fluid inferno)