I have been working with the ad company, Monetizemore, to improve the quality of ads and recently I have implement a CPM floor. Basically, it is a quality over quantity. It means that only the highest earning ads will be displayed and fewer ads will be displayed.
That is the plan anyway, there will be a test run for about a month to see if it is successful. The goal is to display fewer ads while earning the same or better ad revenue.
Wish me Luck!