Thanks for the action you do. You can't do much than that unfortunatly, as the spam attack seem to come from different direction.
To help during that spam attack the dev of SmokeDetector, a bot that help to moderate spam, have changed the spam count risen when it detect a spam. It will help as it take less users flag to get the spam removed by the system.
In the hope it help. In any case the mod team will help as soon as we see some more spam.