I was getting about 700k / hr unrested XP gains in BRC. I love that instance. You can really rip through it.

Only challenge is the second boss. But, if you have the DPS for it, she just falls over. After that, it's a piece of cake.

Stonecore is a whole other story. I gave up on it after the second boss when I saw the trash to the third. I'll get it figured out here eventually. The first boss is pretty easy, it looks like a mess at first, but there's a neat little area just to the right of the worm as you're looking at it where you can park your team and they won't get hit by the underground ability.

I hit 83 finishing the quests in Deepholme, and ripped to Uldum. Hit about 600k / hr just questing out there, and should have 84 here in an hour or so, and then it's off to Twilight Highlands.

Now - the major pain in the ass in Uldum is the gathering quests in the underground temple area. They're a nightmare. Absolute nightmare. I'm not sure if you can avoid them though, since they are the gate to the rest of the Harrison Jones questline.