Game Mechanics: AC/Level Mitigation & Backstabs

[Aadill]

I have *close* to max STR so I still get indrect +ATK bonuses from bard songs from +STR, but are there any songs that offer any direct +ATK bonuses? I would hope it's a matter of an unchecked buff or something simple because that's a fairly large spread over something that should be impossible at this point in the game.