You're welcome! I'm not sure if that was the reason I set my Background Sounds at 20% and I just didn't realize it?
In other things, I can get even more damage, if I use the Haunted Aegis. Even though I have to Block first turn to get the Attack boost out of it, turning the Cursed Coronet to a 175% ATK instead of the regular 200%. Still, I survived starting the battle at 1 HP since Griffons can't get through the Block, and they take >200 damage from a second-turn punch.
EDIT: ... Wanted to explore the Endgame Dungeon again... Didn't realize I could reactivate the ending cutscene by travelling to the end. Huh.
EDIT: Looking at the Credits, trying to find your source for the monster art again (http://www.akashics.moe/), but the "International Phone Number Library" credits seem broken? Is it the same as this?