My guild farms HAAT regularly and my contribution is decent but not great. I do not have any purpose-built HAAT teams and have been advised not to build any until I've finished my legendary characters farm (finished Thrawn and Palpatine, currently working on CLS team). So I'm stuck with what I have for a while but would like to maximize my effectiveness with what I have.
This is what I have right now:
Basically, my best team is my arena team consisting of zPalp, zThrawn, Vader, Tarkin, and TFP. My only other real team is Phoenix (Hera, Ezra, Kanan, Zeb, and Chopper - Sabine is still at 6 stars). Then I have my leftover team which is not a real team but consists of all my other current 7 star toons - Boba Fett, KRU, FOTP, Biggs, and ST Han.
So what I would like to know is what teams to use with which leaders in which phases. I can also swap some toons from my leftovers into my arena squad, like KRU as a tank.
Right now, purely from experience, trial and error, and reading the description of the raid, I put everything in phase 2. Phase 1 is an annoying mess with constant taunts, debuffs, and the fact that Grievous seems to be immune to TMR. I seem to do OK in it with Phoenix but my Phoenix seems to do better in Phase 2. I've tried Phase 1 with a Thrawn lead instead of Palpatine (zeta on Thrawn is on his unique not his leader ability and I just got it today), which helps somewhat but I still seem to do better in Phase 2 with a Palp lead. I used to use KRU instead of TFP in Phase 2 but lately I've been using TFP.
In Phase 2 I'm also not sure what my best option is. Should I fracture the tank chassis or the main turret? Should I focus on the turrets and ony focus the chassis when the tank is disabled, or ignore the turrets and focus the chassis? Currently with my Palpatine squad I fracture the main gun and focus the chassis but eventually kill the turrets with AOE's. With Phoenix I attack the main gun until it's disabled then ignore the other turrets unless they're low from counterattacks.
I've tried Phase 3 once or twice but only with my leftovers since I don't want to gamble most of my damage on a phase I don't know much about when Phase 2 is a known quantity. I've never seen Phase 4.