I've do some optimization suggested by Linda who is a adsense expert in UK. I put a huge ads at the top of the page before, but people may skip it, so I do some optimization as Linda suggested, now these days income double, you may refer to it, it works, hope it may help you.

If you want to know more about optimization, you can ask me or refer to my site and I'll give some suggestion based on what I know, want to be your friend.