If I run speedtest.net I get the following results.

I ran the test four times and got very similary results. While downloading though, inside SABnzbd I only see transfer rates of ~2Mb/s. I've downloaded about 20G so far over the past couple of days and download speeds hover right around 2Mb for each download. I've checked the Glasnost throttling test to make sure that my ISP isn't limiting me. It returns no indication of traffic shaping.
Is there anything I can do about this? Is there any reason I should see these slow of speeds while downloading from my provider? I currently have the astraweb unlimited DSL package that does not limit d/l speeds. I also have blocknews for a block provider and have downloaded jobs directly from them as well with the same speeds.
I don't know where else to ask this question. I don't think it's a SABnzbd problem, just thought I'd ask the general question here in the general forum. Thanks for any input.