I don't know if it's possible, but is there a way for you to undo the "only one report in 20 minutes" thing? If not, I totally understand but there sure is a lot of spam :\
Just another one of those super-spam hours.
Pretty sure you really only need to report a post once, the mods will get it. Also, if there are multiple spam posts in a legit thread, drawing the mods attention to the thread should be enough, they'll then be able to delete all the posts from that thread.
But yeah, these spammers ain't stupid, they know when the best times to spam are (high traffic hours/late night when mods aren't around).
It is what it is, I just wish we could track the these people down and, well, do dastardly things to them.