For 187 visitors per day I would say $2 is pretty good. You might want to consider driving more traffic at this point rather than moving or changing your AdSense. Sounds to me like it's just a traffic issue
Could you please review my site My Loans Consolidated especially regarding the Adsense? I wanna improve my Adsense earnings.
Right now my Adsense earnings is only about $2 a day
From my awstat, I have an ave. of 187 visitors per day.