Piper role here is as an enabler for Vivian, maximizing her abloom damage output, utilizing her EX dash cancel to proc abloom with cheap energy, fast procing ether disorders, and gives a bit of buffing capability.
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Piper Yuzuha Vivian
Deadly Assault
Piper
Yuzuha
Vivian
4 Limited
Video Showcase
Agent 1
AgentPiper
W-EngineWeeping Gemini
4-Pc Drive DiscFanged Metal
2-Pc Drive DiscChaos Jazz
Agent 1 Details
Agent 1 M6W5
Main Stats | ||
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4 AP | 5 ATK / DMG | 6 AM |
Substats (29) | ||||
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Agent 2
AgentYuzuha
W-EngineMetanukimorphosis
4-Pc Drive DiscProto Punk
2-Pc Drive DiscPhaethon's Melody
Yuzuha alternative W-Engine would be 
Weeping Cradle or 
Kaboom the Cannon, but the damage difference is quite high between her signature, since the AP boost matters a lot for Vivian damage output.
You should use AP disc 4 on Yuzuha If you have enough ATK substats to get ~3000 ATK, as it minimize the physycal anomaly dilution caused by her own anomlay buildup.
You can also use 4pc 
Swing Jazz here, but 
Proto Punk buff uptime is better, and you can't use the double Vivian chain stun rotation if you want to maximize 4pc Swing Jazz uptime.
Agent 2 Details
Agent 2 M0W1
Main Stats | ||
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4 AP / ATK | 5 ATK | 6 AM |
Substats (Count) | ||||
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Agent 3
AgentVivian
W-EngineFlight of Fancy
4-Pc Drive DiscPhaethon's Melody
2-Pc Drive DiscFreedom Blues
More than 50% of the damage is done by Vivian anomaly damage (Corruption, ether disorders, and abloom). So her having as high AP as possible is preferable. I find that AP substats for her weight twice more valuable for her than ATK%.
Flight of Fancy is really needed in this rotation, without the 40% buildup buff, she will not proc corruption off-field smoothly for alternating disorders. Without it, you'll need other buildup buff to compensate for it, like M2 Yuzuha for example.
Agent 3 Details
Agent 3 M0W1
Main Stats | ||
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4 AP | 5 DMG / ATK | 6 AM |
Substats (25) | ||||
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Run Specific Notes
Miasmic Fiend - Unfathomable
Season 16
HP: 101800565
Buff:
Artful
· Agent DMG increases by 20% and Physical DMG increases by an additional 20%.
· After inflicting an Attribute Anomaly on an enemy, the enemy's DEF decreases by 10% for 10s. After inflicting Disorder on an enemy, the enemy's DEF further decreases by 25% for 10s. Each effect's duration refreshes individually.
How to Play & Additional Tips
To utilize the Artful buff and optimize the damage output as high as possible, disorder chain rotation with fast and alternating disorder is the best scheme for this team. This should be doable for the team, as Piper has a really high buildup rate, and Vivian abloom off field buildup, helped by Yuzuha aftershock, will suffice the corruption procs.
The best way to optimize the damage againts the fiend is to maximize the anomaly damage through Vivian abloom count. Getting high Vivian abloom count is possible by getting her defensive assists (+2 feathers), and use up all of Vivian abloom with Piper EX dash cancel tech, so when Vivian use her ultimate, there is no overflow feathers (overflow feathers = wasted damage).