hmmmm.....400,000 and 700,000 hits a month mostly from the hun? I was under the impression that the big guy would send that to you in a few days
Anyways I'm not too sure what to tell you....tgp is a tough game to win at.
The only thing I can tell you is to strive to make a gallery where your ads grab the surfer by the throat, slap him in the face and scream at him to click that link. Then hope your sponsor is able to convert. If not find another one.
Maybe try your hand at free sites and learn to convert that kind of traffic first then try and tackle tgp traffic.
Good luck!