As I said, IF you find someone postwhoring or trolling outside the nominated area, report it. I leave it to your good judgement what postwhoring is, ie more than one completely irrelevant post by the same user with no point in mind other than to bump one's postcount up. When reporting a user's posts in a thread, be considerate and don't report every single post in the thread by the user, and where possible combine reports from multiple threads about a single user into one report.
Leave the moderating part up to the moderators. If you're being irrational or over enthusiastic in reporting people, or if you're seen only to be reporting certain other members out of spite, then I'm sure they'll let you know in due time. I'm sure the 4 people who slim speaks of will watch where they post in the future, or risk being placed on moderator review.
What's done is done. I suggest you don't dig up the annals of SAU history to trace all the posts that can be reported. Just report the ones that happen in the future.
That said, we are working on a new version of the forum atm. I'll see to it that the new implementation dosen't use post counts to avoid people having a running tally of how they're doing against each other. I've removed the postcount that shows uner the username next to each post as a slight deterrant for now.