One thing that you are not doing is having a fully fledged mobile version of your site. You should be making 50% of your income from the desktop version, and the other 50% from mobile version of your site, as it is more profitable, if done right.
The best way to go, is to work with
Bitter Strawberry and
Sex Goes Mobile (both at the same time, or ad rotation), and combine it with mobile popunders from
Plugrush.
If you work on high traffic sites, you can move on to
First Mobile Cash, and
VPS Mobile, as these are somehow more advanced.