Why Corvus’s damage is not increasing according to Persistent charge..

At max charges corvus’s damage is not increasing as it should be. 1 charge give 1 cruelty. Which boosts cruelty damage by nearly 3000, so at 4 charges damage boost should be around 12000, considering armour and resistance damage should be around 8K with medium attack.
Or some other math is involved?
Or some other math is involved?
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