You also need to have a mobile version of your website. Even though you are getting less mobile traffic, it is more profitable, and if you dont work with networks like
Bitter Strawberry, and
Sex Goes Mobile, you are definitely missing out. Mobile popunders from
Plugrush, are very important part of equation too.
Other ad networks to consider, would be
First Mobile Cash, and
VPS Mobile, and they may turn out to be as profitable as the first set, or even better, on some of the xxx sites.