Done with my SR run. This boss was tougher than the ones before. Teams with healers are easy enough, but the ones without are quite difficult to keep alive.
The Leona SG comp was the worst, had to cover almost everything and it sucks the green projectiles aren't easy to read. You can only tell if it goes left or right, but most of the time not which slot exactly it's targeting. Covering with the whole team loses too much dmg.
The balls in phase 1 are pretty difficult to hit consistently with how much they're moving and missing shots is a huge dmg loss so that requires a bit of aiming skill. Pause buffering helps a bit.
You can also pause buffer the chain QTE to clear it before it stuns your team and that's a big dmg gain.
Also I found it's best not to delay any QTEs because if you're fast with everything the boss spawns in one more set of balls at the end which can be quickly broken with explosions for a lot of extra dmg. Some teams required specific delaying though, like the Cinder comp to not get her burst eaten by the ele shield.
And I know most used the Miranda + Mihara comp, but I tried it and it wasn't better for me than the team split I ended up using. Maybe my Miranda and SRosanna aren't invested enough or it's a lack of dupes and ammo lines on Mihara, but it just wasn't performing well and I struggled to break the 4 balls within Helm's burst which you need to be able to do to do the strat properly.
The Absolute team still feels underwhelming given this is the SR they were designed for. If only they had given Emma or Eunhwa CDR then the team would've been actually meta.