I've been testing these 2 quests to confirm my initial impression - quest item drop rate/reward is way too high.
It is hard to back my claim with some data, but x4 EWS from Seekers with basically 100% QI droprate makes no sense. Same goes to Zero Hour.

My suggestion:

x2 reward for Seekers of the holy grail
x3 reward(1/3 price) for Zero hours Q