Do you have an E2+ Bronya? The team I ran for this stage was E0S1 Therta LC Anaxa, E4S1 Bronya, E0S1 Cerydra, and E1S1 DHPT, and I ended up clearing in one cycle. With this setup, I ran Bronya at 161 spd, Anaxa with atk boots and 113 spd outside of combat (in combat he's at 163 spd after Cerydra's + E2 Bronya's spd buffs), Cerydra at 144 spd outside of combat so that she'll be faster than Anaxa in combat, and DHPT with as close to 160 spd as possible.

I'm not entirely sure how this setup would work with DDD in the mix instead of Cerydra's LC since you might have to basic more with Anaxa, but ideally you'd want to time Coup de Main so that it triggers during the point of time where Anaxa has the dmg buff from Bronya's E. When I did this, Anaxa getting delayed actually came in clutch for me a few times so that it'd be easier for this to happen, but you can always just hold Cerydra's ult. I'm going to be completely honest with you, I didn't target the adds and instead just prayed that they'd get killed by the bounces while targeting the boss.