New to warrior end game tanking questions

[Sensu]

And on Turn 9, I pretty much keep it up on Nael all the time as it will continue ticking when he's jumping around all over the place.

Might want to check that health bar then next time, because dots don't actually keep ticking when Nael jumps. On all the other examples you gave it is actually very good to use it then, and I really recommend this for max damage output.