The seem to have discovered that the filtering mechanism breaks when one tries to filter more than about a dozen IDs. Previously filtered IDs become visible again. There must be some way that BO or CodeMoney can increase that limit.
But the real problem is that the IP hashes get a new salt for each new thread. You have to refilter them each bread. Maybe that could be changed to salt them by a global QResearch salt + the date. That way we remain reasonably anonymous relative to other parts of 8chan while allowing filters to last the whole day.