Currently, this 7-12 quest has minimal pay because it's hosted through the Ilmateri, as well as minimal loot and XP. Simply put, it's not worth buffing for the pay, and due to the dispel spams on the quest, rather pointless.
I would recommend converting it into a 4-8 power level quest and downgrading the monsters that appear there so that the pay for the quest is more in line with its recommended level range. I can't detail the exact changes I'd put in, since it's spoilery, but the number of certain spawns can be reduced, while other spawns should be replaced to better fit a 4-8 level range.
Rose Faerahrn (Alfirin Baequirahael), arcane hierophant / Justine Thyme, the last Warforged / Areru Andan, airhead / Valor Pyrre, Cormyrean pathfinder / Syclya Ferelle, arcane trickster / Maria Flats, Mystran paladin / Tara Esmurla, Ilmateri bardess