Shaak Ti Counters

Haven't face a team like that but I think that Bossk lead BH or Talzin lead Nightsisters would go well. Being NS a better option in theory.

You need a constant taunter to absorb the continuous damage from counters.
With BH, Bossk would fit that role.
With Nightsisters, zombie would do.
Talzin can stop the constant cleansing due to plague.

Qira and Nest
Anyone with AOE Daze will halt them nicely.
Rex, Wampa and Chaze if you want that route

My suggestion is always going to be "read the kit and determine which abilities are going to be a problem, then think about how to counteract them."

Probably overkill, but Traya would make them kill themselves with all those counters.

Traya would be the best counter, as with bugs but yeah it would be overkill I think