There is no hitpointgain per stars. At vet1 no stats are gained only the vet1 abilitly.
At vet 2 German vehicles gain a 0,45 received damage modifier. At vet3 they gain a 1,78 damage modifier.
Soviet vehicles at vet2 gain 1,78 damage modifier and 0,875 received damage modifier. At vet3 they gain an additional 0,6 received damage modifier.
German Infantry gets at vet2 a 2,25 armor modifier. At vet3 a 1,78 accuracy modifier.
Soviet Infantry gets at vet2 a 1,25 armor modifier and a 1,78 accuracy modifier. At vet3 they get a additional 1,8 armor modifier.
Therefore the vet boni for Infantry are exactly the same at vet3.
The Armor modifier inrease the durability against smallarms only.
The received damagemodifiers increase the durabiltiy against everything effictivly doubling their hp. But received damage is better then a hp increase would be, because your would repair only at half the current speed then.
But you are right that this will be changed, if that was what you wanted to say.
