Track your best performing ad placement from "channel" You can increase your CTR by experiment with ads placement. Try to blend the ads with background. For me, when I get very low CPC, I'll use competitive ad filter in adsense control panel. I use adsense preview tool to preview the ads and block the ads that seem to be low CPC.
Just put image ads in middle of your content & show text ads as more info. You will earn approx $50 a day.