That is what it does for me.
Edit:
I bet the dlc has an updated efefs, chaning the offsets. I need to make one that find offsets itself it seems. Should not be *that* hard, just more loading times.
Well good luck with that. I've done about all I'm knowledgeable enough to do. My only other course of action was to try decrypting the dlc CIA and give it its own layeredfs, but I'm very doubtful that would even work...