If the white mage just cast stoneskin before the battle begins and cast stoneskin about 2 seconds after the battle begins, tank should have no problem keeping hate. Sounds to me either tank don't know how to build up hate or white mage just overheals within the first 3 seconds of the battle. I know as a white mage i had that a lot in the first instance i went in. Start of with regen and a cure and you should have no trouble getting hate from the tank.