You can always pm me Papa and I can give you my skype. I can look and maybe give some tips. Title blending with color to nav helps, large rectangle top left with content wrap works. Large skyscraper is also a top earner. But you will need prominent placement to gain attention. This will also change what you get paid for a click as well to some extent. Page position seems to have an effect on what you earn.
Are you kidding?? You are doing damn good man. Well it you want more, I would suggest affiliate marketing. Get some affiliate links from Amazon or Clickbank and it will definitely increase your earning.