Sethek Halls isn't too bad, you just have to kill the Lost Controlers first. I'd run in with my tank, leaving the group in the previous room and kill the controller in each group before I tagged then next one. In the end was doing Sethek in ~18 minutes.

Also, Botanica worked well for me. ~20 minutes a run. I mixed up my instances so I could honored with each faction (bar keepers of time).