Damage model problem of tanks in the IL-2 Sturmovik: Great Battles

An example of a gameplay in tank battles of the IL-2 Sturmovik game. There are clearly problems with the armor penetration model of the Pz.Kpfw. VI Tiger tank. The T-34 hit the fender three times, twice in the rear projection, and also in the rear of the turret. There was no armor piercing...
00:03 Original gameplay
03:53 T-34 point of view
07:17 View at the Pz.Kpfw. VI Tiger tank
10:39 View from above

[@Avetorro]

What ammo were you using? I’ve only ever used HE on a SU152 to kill them so I’m not sure how other smaller rounds perform.

[@CyberZeeland-jx5sm]

Particularly in that episode I've used standard Armor Piercing High Explosive shells which should both penetrate armor and do damage. Distance of shooting was 200-300 meters and angles of Tiger's armor plates we practicly perpendicular but there was no effect...