It should go down in BR since it’s APHE can’t even pen BR2 tanks since it’s so weak so why it’s at BR3? It should go down in BR2 and get Heat rounds like PZ3N. Put 251/1 and kfz7 at BR1 and 251/9 (with heat rounds) at BR2.
It also needs to have a few more guys in the squad since just 4 soldiers in a single squad is completely inferior to the paid APC (p2w) or even a truck.
The best you can do is to pray that rng will bless you with enough pen to hit their mg port or fuel tank.
T-50 and Mk 1/M3 are extremely hard to take out at mid-long ranges since only few spots can be damaged. Crusader’s and T-28E Armor is thin but may tank multiple APHE shells.
And when you get uptiered then it’s a game over vs T-34 and KV-1 spam.
Pen is absolutely dreadful it’s below 40mm and you only killed them because they exposed their weak sides to you, frontally you can only die in a single hit against them. Let’s see how you will do against T-34 or KV-1 or Matilda i’m waiting
There indeed are situations when you can blow up a T-34 of any version using the Stummel 75mm cannon (this screenshot shows the event T-34-100), the sloped sid armor can be penetrated from close-to-point-blank and the T-34 has to be perfectly sideways but that also happens iwth the right amount of tactics and a bit of luck.