While I understand the move to keep the XP rate on Y'Shaarj at 100%, Tel'Abim with its increased leveling speed simply felt so "right"...
How about increasing the XP that is gained from PvP on Y'Shaarj instead? This would also incentivize players to do battlegrounds at low levels. Would not necessarily have to amount to the same speed increase as Tel'Abim, but maybe there could be a happy medium.