Hi! I did a bit of searching and didn't find anything for this spot, so if this is a repost feel free to close/delete this thread.
Schnottz's Landing on the far west side of Uldum (shown in the pic) has several mobs that are marked as hostile, but do not aggro and aren't very strong at all. At level 83 on my Shadow Priest I was getting 480k XP and several stacks of Embersilk Cloth per hour (with Northern Cloth Scavenging). This is the only character I have done testing on in this spot, and I have not done any quests up to Schnottz's Landing on this character either, so if there are any changes relating to quests, please let me know.
Edit: Because the mobs are closer together and have faster respawn times, it seems the boats off shore from the Landing are better for farming cloth (and probably no doubt grinding XP). Thanks to xmolder for the tip.
Here's the location:
If there's any info that I should know about this location feel free to reply or PM me.