I've create a new revised version of the entire extra civs pack. It's working great! The only problem is that ModBuddy/GameSpy upload is failing at the very end with a strange "invalid file id" error. I'll keep trying things to publish it to the in-game mod browser.
http://home.pcisys.net/~sean/civ5/Hukkak Revised Extra Civs Pack (v 1).civ5mod
http://home.pcisys.net/~sean/civ5/Hukkak Revised Extra Civs Pack (v 1).civ5mod