Wow... Totally missed that until just now.Normally each time you repeat a quest, the amount of experience the quest grants decreases. This remains true as of Update 19, although the curve of how much XP deprecates after how many runs as been adjusted. For each repetition of the same quest, the deprecation is 20%.
Not saying that is doooooom but for tr leveling without stones or pots it will surely cut.
Counting in +20% daily bonus, and assuming the penalty still starts from 4th run on (I hope so...), the cumulative loss of an E-H8-N farm would be -130% base xp of the quest.
So I guess I'll have to start learning some less-run quests, or sometimes farm on elite instead.