ok...are you using the
MightyAdsense plugin? If not, you might want to consider it. Super easy to install and use.
What I noticed is that your adsense is only at the top. Yes that is a good place to start but honestly your visitors are coming there for content. So I would think placing some ads among the content would grab their attention AS they are reading.
good luck. It certainly doesn't hurt to try and make some money when you have the traffic.