Okay, I have the bug fixed, people!
I will edit the first post later tonight or tomorrow, I don't have time right now but I can say this:
it requires some database work;
more importantly: if you don't want to wait X newsthreads before it'll work entirely, you will have to do some search-find-and-query work on the newsthreads you already have. But, I can safely say that once done, not a single random post will ever appear, anymore. Ever!