Regarding the Annihilator setlist added under the wrong artist... Anyone should have the ability to correct this.

If there is a duplicate setlist (one with right artist, one with wrong artist) then notify a moderator and we can delete the incorrect setlist.

Regarding Blaze Bayley, I fixed the song "Tenth Dimension" so it's no longer listed as an Iron Maiden cover in any setlists. So it should no longer be autocorrected to an Iron Maiden cover. In the future you can uncheck the autocorrection checkbox and that will stop it from adding a cover.

Unfortunately there's nothing I can do to prevent the Annihilator setlists from being added under the wrong artist. The only thing to do is edit the setlists one by one to change them to the correct artist. I went ahead and did this. But anyone should have the ability to do this, so you could do it in the future, if you were so inclined.

You could also use the "Feedback" button on the right side of the page to notify the administrators of this problem. They might be able to take some permanent corrective action.

The Blue Öyster Cult setlist you linked is not a duplicate; they played two shows on the same night, both with slightly different setlists, and I assume attendees as well.

Why do you make so many tiny edits of setlists ?