User blog comment:Hayashi H/Spring 2016 Event Guide/@comment-26486243-20160521094754

At present, we know the postcap multiplier is 1.63+ for twin Wurf, 3.5 for KaMi, and the firepower addition effect is 112 firepower. This means 175 base firepower on Kasumi Kai Ni.

The One-punch-Tsundere parameters against 270 armor Central are:

Assuming no critical strike:189-351

If Kami's +2.5 postcap multiplier is added to Wurf's +0.63 multiplier, result is +3.13 (4.13 multiplier)
 * If KaMi's 3.5 postcap multiplier replaces Wurf's 1.63 multiplier:
 * In day, 155*3.5 = 542, so 191-353 damage.
 * At night, 175*3.5 = 612, so 261-423 damage.
 * If KaMi's 3.5 postcap multiplier is multiplied by Wurf's 1.63 multiplier, result is 5.7.
 * In day, 155*5.7 = 883, so 532-694 damage.
 * At night, 175*5.7 = 997, so 646-808 damage.
 * In day, 155*4.13 = 640, so 289-451 damage.
 * At night, 175*4.13 = 722, so 371-533 damage.
 * If Wurf's 1.63 postcap multiplier overwrites KaMi's multiplier:
 * In day, 155*1.63 = 252, so scratch-63 damage.
 * At night, 175*1.63 = 285, so scratch-96 damage.

Depending on how much damage Kasumi does on Central Princess when she hits with a KaMi-Wurf™-Wurf™ build, we will be able to conclude which model of postcap damage is applied.