Huh what? ToAU received the same exp boost as the entire rest of the nonabyssian world. Maybe your server didn't have the astral candy at the time you checked, and you killed a mob that was just barely EP.
-edit-
That being said though, ToAU could use some touching up done to some of the content there. However, SE has already acknowledged this and are planning on doing that. They already did make besieged a bit cooler.