War Within Delves: Tier 11 (Season 1)

I tried this solo, with my 620 BM Hunter and still it felt extremely overtuned with some unavoidable spells and huge mob hps.
Still, it felt doable but I couldn't at first tries.

One useful trick may be resetting the Delve when you're running out of keys, I mean it's the whole thing all over again but as a failsafe.

Besides this, suggestions for average ilvl, easiest Class/Spec and Delve combo are appreciated.

*Update:
Later I did it with Tank DH & DPS Brann, it was a piece of cake like that, just don't do unnecessary pulls, go one by one and with tank cds you can save yourself if something goes wrong.
I continued going like that in S2 too and I did almost all of them in 11 with ease.

I found that the easiest delve to get 11 with is The Underkeep. If you go slow and steady, you can position the mobs into the path of the Crazed Abominations and work through it. In the end there are only the 3 Abomination to kill, which were relatively easy to avoid and wear down and there is no final boss to deal with.

In case you missed getting this achievement in Season 1, there is a Season 2 version War Within Delves: Tier 11 (Season 2) which also grants the title "High Explorer".