The nature of hell-banning means you aren't able to mark exactly when you were hell-banned, therefore the algorithms never improve because there isn't a "this caused a false-positive, let's fix it" feedback loop. Unless I'm missing something.
All fixes to hellbans go through site administrators (eg pg), and therefore he is aware of the false positives. He has access to data on when and why it happens, and is therefore able to track those issues down.
If you don't post frequently you can pinpoint where you got the mark. Search posts by your user and see where the auto-dead begins. I did some trollish posts on my first account, but got a ban because of a front-paged duplicate instead.
Details on my profile. I felt cheated because I had no heavily downvoted comments.
