I had this problem too. When editing the config file, it can exist in BOTH places...my games and steam folder. In my case i was editing the steam file but it was looking at "my games" folder copy of the config file. So once i updated the "my games" config file as well, it worked.
Also, in the same config file one line (the second one) they said to change did not exist in my config file...i just added the updated line to my config file as a new line.
Its funny, on this same forum i had the exact same post all typed up and ready to hit submit...."help!!"....then i figured it out. For a minute there i thought i accidentally hit "submit" when i saw your post...good luck!