To me the nature of vampires changes between Storm Front and Grave Peril. In SF Harry's monologue indicates vampires have a hard enough time just holding themselves together on this side of the barrier, indicating that they (all vampires) are creatures of the Nevernever. By GP this has changed, it seems they are more tied into the world and there's never again any mention of holding themselves together, just keeping the flesh masks on. Also by this time there are now multiple courts of vampires, etc.
Now we have a great excuse here in that the case files are all first person, and if something changed it's just that Harry didn't know the truth beforehand and is being shockingly truthful in his retelling of his own failings. I classify it a retcon, but that's just how I see it.