Ancient Werewolf Skull

Does the xp rate on seem broken to anyone else? Recently got it for both my toons and also got for my bard. My typical grind area is the Lair of the Blackwing in DoN so we tried doing some xpage there after training light blue mobs didn't seem to xp the mask very quickly. The mask gets around 2% xp per Blackwing, the cloak was getting more like 15% and they're fairly comprable in terms of stats. One of my grind buddies did some research and others are saying that intelligent items like the mask (it can emote, oo wow) seem to xp much more slowly than non-intelligent evolving items. Anyone know the rationale on this? Way I'm figuring it, it'll take about 100 Nest runs, ~ 100 hours all said and done to max my mask out and that seems assinine in the extreme. Serious flashbacks to the old hell levels...