So here is my NS + Anakin team that I use in Phase 3 of Sith Raid.

The first time I used this team, I got 14 mil damage on the phase. Since then, I have increased Anakin almost 3 gear levels (plus relics), put a zeta & a gear level on Daka, and put a gear level on Talzin; I have also put more speed and tenacity on their mods. Despite all this, I keep getting lower scores. Out of the last 9 times I've tried it, my best score has been 9.8 mil. Been using the same strategy each time. If somene could help me figure out why my score is lower than it should be, I would really appreciate it. Also, here are my mods: Talzin

Asajj

Daka

Anakin
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Replies
Beyond that, do what you can to up the speed secondaries on the NS shown. They are still kinda slow.
Before you send in your NS send in a single g11/g12 suicide character who's sole purpose is to get hit by Traya's Isolate and then die quickly before she takes another turn.
When you send in your NS the Initiate needs to die fast so that Traya doesn't get her Isolate ready again. After Initiate's death try to get a few more hits in on Traya before you kill off the light sabers with special attacks. Hitting her builds up her tenacity.
#1 - not sending in the suicide team to eat Isolate. I use a G11 Scavenger Rey. Takes a hit from all 3 sabers and then dies from isolate. Perfect.
#2 - either Daka or Asajj are dazed when you start topple. Talzin "can" be dazed, but then she won't gain TM from the resists. It'll lower your damage slightly, but not enough to derail the whole run. Might need a second topple to finish the entire phase. Ideally you want none of the 3 surviving Nightsisters dazed. The only one that doesn't matter is Anakin. He takes his bonus turn regardless of being dazed. I tend to have to restart the most for this issue.
#3 - not enough CC on Initiate. You want 6x CC mods with a CC triangle, and filter for CC secondaries on everything but the triangle. Do NOT use a potency cross on Anakin or Initiate. My Initiate is G7, level 66 like yours. CC is 66%. My Anakin is only G11.
As long as #1 and #2 happen I can clear the whole phase in one topple.
Also - try searching for+ offense crosses for Talzin and Asajj. Other than slightly better gear and speed on Daka, and your relic Anakin, my team is almost identical to yours and easily does the whole phase.
I believe his current tenacity crosses are better. They reduce the chance to be dazed.
Their usefulness outside of STR is irrelevant. You can't join TW or GA during your run, anyway. Rearrange your mods after your raid and you're fine.
Use an offense cross.
She only uses her basic during the topple. She will always have her AoE ready.