I still say, I have the best connection ever right now. I can dual log and no lag. Before the last patch, it was random and bad lag when it did come. But, like ET said they can't please everyone and they are working on it....so, idk what else to tell you.
I mentioned Gameboost in another similar thread (yes, i know it doesn't up your internet connection or the host speed, but it does help the Comp functionality that you are using to play the game with.) It is a free download and worth a try at least.