Petard mortar penetration

Why does it have only 3mm more penetration than shells with half the TNT equiv such as the 15cm german reserve tier vehicle?

Petard - 17.73kg TNT - 64mm pen
15cm - 8.6kg TNT - 61mm pen

How does gaijin calculate HE penetration?

if (UK) {
pen = pen/2
}

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if (ITALY) {
armor=armorGERMANY/3
}

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That realistic though Italy sucks compared to Germany in tanks

Ik

Someone made a graph, the required explosive for more penetration is exponential, with like at 3 Kg onwards or so you need far more additional filler to get any noteworthy penetration, i mean look at the 38cm rocket, 83mm or so with 125kg filler. thats 7x the filler aquivalent, and only 1,3x the penetration.
Edit, i found it:

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