With what you have:
zVader
Tarkin
Palpatine
TFP
Add a 5th that removes TM on their own. Can be Jyn, Bistan, CLS etc.
I built almost this exact team for HPit, but Thrawn instead of Palpatine and it's decent. Unless you have really high speed you'll get stressed in the last phase because the Rancor is surprisingly faster unless you Zeta Thrawn's unique. Jyn is great because her AoE if omega'd grants advantage to the target ally. So you can pass to TFP to guarantee tenacity down. And can pass advantage to Vader for culling blade.
I then used my FO team and they can solo it at much lower gear levels and in half the time:
KRU, Kylo, FOST, FOO, Executioner. Or swap Thrawn instead of FOST.
And then half the time of that if you use Wiggs, CLS, Han (however he's the HPit reward so it's a long grind)