The only thing I can say, but it isn't really something I agree with, is that whenever there is a balanced map someone would say, "it's now a human map!"
Glad someone else sees it the same way. Any time there's a map that humans are winning on, the ghoul players bitch about it and it has to be changed to be tailored to the ghouls. But, when there's a ghoul rape map, It doesn't get changed for some reason. Probably cause whenever the humans complain, the ghoul players tell them to STFU and deal with it, and they aren't heard.
I'm still going to stick by my opinion that GvH is balanced, just not in the way you think. "Jitter/sjasrape" only happens when a map is crowded. If a map is packed with 32 players, then it's obvious that on balance the Ghouls should be winning. Since they have powerful melee attacks, there is no other way this can play out. If you have been referring to uncrowded games, then all I can say is that I've seen Humans winning enough to say it's not grossly imbalanced.
The "Deathbox" theory. I've been saying this for quite a while now, around when GvH was released. I fully agree with you, that the more ghouls (or death boxes) there are in a map, the more the humans are gonna get owned. Don't know how to fix this though, other than larger maps.