The only speed tester that I ever trust is Speakeasy's (»speakeasy.net/speedtest
). It's always been spot-on accurate for me, even when I test using some beefier connections. Stick with the Illinois test and you should be golden. My work modem has an unrestricted 25Mbps downstream / 3Mbps up BEX policy, and Speakeasy Illinois always accurately reports it.
Also, if you have a virus scanner like Avast that does real time scanning, it may be the bottleneck. I'd bypass any routers, disable anti-virus, and see if that improves your results.
I may work for a telecom... but that doesn't mean I'm one of the bad guys.