To motivate players to do quests (but not to make them too easy!) we've raised quest item drop rate for following quests. Instead of applying the same rate for all these quests, we went through them one by one and changed them appropriately and then tested all the changes.
In quest Clean up the Swamp of Screams we raised amount of Golden Ram Coins you gain for Talons of Stakato. We used similar principle for quests War with Ketra Orcs and War with Varka Silenos and raised amount of Buffalo