Nice to see that you're doing well. But remember to wait till verification - i saw in many parking providers cutting even like 80-90% of monhly earnings.
I think we should consider creating mini pages or landings. In case of good domains it would be more profitable than parking. Parking gives less and less profit.
I guess you can also search for adsense partners - I read that you can enter the codes on an empty webpage. Guess it depends on trafffic volume as well.
You can also try different monetizing sites - earning on direct sales - where parking companies will not cut your earnings at the end of the month. I enjoy earning 30% comission with various geo targetted offers.