If you notice there are spikes about half way through every round then it settles at a certain point. I wonder why this is? Anyways Bitmain will have to come down in price since the release date is 2+ diff increases away.
someone figured out that he will make more btc if he turns off his big mine for 2~3 days.
those 2~3 days offline are a good trade off, because the difficulty for the next two week should be somewhat lower.