Doc..... I'm not going to give you too much shit.. because I somewhat understand where you are coming from. I have the same problem with a site on yahoo because of their damn directory listings. So I feel a little of what you are going through.
However you can't expect to sit around and just get your rankings with no work. If your affiliates work harder than you, they will out rank you.. plane and simple.
Your waning page is a PR1 I mean seriously you can't expect to rank with a pr 1. Top it off with you only have "BustyAmateurBoobs" on your index in "one" spot on the text and then in the title. Damn man the first rule of thumb is to work your keywords in as much as you can even on the warnng pages.
On your tour.. "Our specialized team of Big Boob Hunters in bold but "Busty Amateur Boobs" is standard text. Which leads to another issue.. You are complaining about people targeting your domain keywords, yet you turn around and do the same thing to your compitition.
Looking at the text Big Boob Hunters which is someone elses site..
http://www.BigBoobHunters.com So if you expect Busty Amateur Boobs to be your keywords, should Big Boob Hunters be theirs?
Complaining will get you no where, you need to do the same thing us affiliates do.. We work at getting our positions, so dont expect to keep yours with out working as well.