Follow up on this, I ended up switching back to 4x Hunter/1x Shaman and leveled them up from scratch on Alliance side. I was able to do a Mythic Maw of Souls in ilvl 840 or less for the entire team and it was much smoother/easier than the druid team. I'm really happy I switched but wish the druids did better. I did the same dungeon with the druids as a comparison in ilvl 890 gear and it still felt like a struggle.
The one key difference would be my AP was maxed out on the hunters, while the druids it was max except for full concordance.
I don't think that was enough to push the scales.