Ages ago, I three starred the second tier of the Secrets and Shadows Assault Battle. The last few times it has come up, I can't make it past Sidious in stage 4. I have done a ton of work on my Nightsi...
A trick I used to use was have Hera on your NS team and put "Back up Plan" on Daka, so when his AoE goes off she can come back and just revive everyone. Talia can help with stagger so everyone can get a turn off before his.