OK, I am not in the tgp game very much at all, I hve dabbled here and there...BUT, I have a lot of friends that are, and I can almost bet that these certain friend control about 80% of the porn star tgp traffic on the net. These guys have some of the biggest porn star tgp's and free sites in existance
http://www.psktraffic.com is their clan site, but keep in mind, you will probably have to email each one individually and gain some sort of business friendship with them before you could ever submit to them