OK provided you have done all of the expected things.....checked for viruses, spyware, keystroke monitors etc.....done the defragmentation of your hard drive AND registry.
You have done all of the above right? Good! Make sure you are using the latest Van Buren settings....Version 7 I believe....https://testmy.net/forum/t-1013 this should be the link you need to get there......try the DW6000 settings there.
Oh Yeah, use cablenut to delete all of your previous settings, before loading the new ones.
Reboot and check out your speeds......if you still are not happy, I have some settings, plus I have done some registry tweaks I can pass on......but before you try any of my settings....TRY VAN BURENS STUFF FIRST......if you still can't get what your after shoot him an e-mail......I am not trying to put you off, Vans settings work with allot of different systems. Mine are pretty much customized for my machine, but have helped others so I do offer them.....
Good Luck
Buzz