DPS Si Team

Si: Required ULT Efficiency: 29.9%
Body: Type 50 Yinglung Soft Armor
Gloves: Type 50 Yinglung Gloves v2
Kit 1: Type 50 Yinglung Beacon
Kit 2: Redeemer Seal

Arcane: Required ULT Efficiency: 39.7%
Body: Eternal Xiranite Light Armor
Gloves: Hot Work Gloves
Kit 1: Hot Work Power Cartridge
Kit 2: Hot Work Power Cartridge

Tangtang: Required ULT Efficiency: 25.7%
Body: Bonekrusha Heavy Armor T2
Gloves: Bonekrusha Wristband T1
Kit 1: Bonekrusha Mask T2
Kit 2: Rift Trekker Silver Blade

Xaihi: Required ULT Efficiency: 44.3%
Body: Eternal Xiranite Light Armor T1
Gloves: Eternal Xiranite Gloves T1
Kit 1: Eternal Xiranite Bracing Slab
Kit 2: Redeemer Seal

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Alternatively, you can use Detonation Unit on Arcane for more Arts Intensity and Will, but you'll need to switch for Eternal Xiranite since Hot Work won't give you enough ULT Efficiency.