So I did a thing. https://www.twitch.tv/slootbag/v/86261831
Run starts at 6:18:00. The DK was 16 ilvls ahead of me, the hunter was 12, and Slootbag was 24.
I went Zeal to try and shift a bit towards AoE. Still lost on pretty much every AoE pull, but it wasn't by a terrible amount most of the time. Everyone was reasonably close on the first boss, I played like shit on the second boss so I was bottom, (I'm still fucking clueless when it comes to playing around Sapped Soul) I was pretty close to everyone on the third boss, and I was top on the last 2 bosses. It was a reasonably good run for me, but I could have done better on some pulls and I stood in fire a lot cause I'm bad. Didn't die though, so I got that going for me. Since I was top on 2 bosses I'll call it a success.
To me that seems reasonably balanced more or less. 16 Ilvl is quite a bit, and I think I could have beaten or kept up with the DK on AoE if that gap was smaller. Obviously if I was extremely competitive on single target with such a large ilvl deficit, I would have been top without question if that gap were equalized. I don't know for sure how skilled the DK and hunter were, but I'm guessing they're reasonably competent because they both had Defiler's End. I just hope we don't get nerfed. ^_^
PS: Kings was about 9% of Slootbag's healing throughout the dungeon.