Balance druids had a pvp talent that seemed to stack well but it has since been fixed. Leader of the Pack stacking looks amazing but since it's only used in open world you can't build a playstyle around it. If I could use it for Mythic + would be a huge new option.
If Holy Paladins can burst that high it is interesting but I don't tink the window is that long. Their ability Glimmer is pretty nice but its getting a nerf in the next patch. It should still be viable but less so.
5 Paladins may work for Mechagon though now that I think about it further.
I'll work on moving this conversation to a new topic so it stays relevant.

I haven't posted my macros but their not super amazing - additionally if you can the AV event Korrak's revenge is supposed to be amazing EXP if you want to level that way, also since druids can queue up as a group for dungeons it may not be worth the boost.