Every post I have read about this Google matter come to the same complaint. Keywords are not working,
PR mean nothing. The one thing that does seem to work is: Google is using "Organics." Seems really more like headers.
I've heard of sites with no mega tags hitting #1.
If your page has "free Iphone" as a header you may see a rise. If it says "iphone no contract" and that is your main hit keyword then you know what you need to do.