Broken Shot Mark.8 and SV.1

half of the time I shoot a heavy tank like a Tiger or a IS the shots either do nothing or bounce off and just scratch the vehicle. Even if it is a perfect shot like on the side of a IS-2 at point blank and at the perfect angle the shot would just bounce and deal no damage to the turret ring. Both and take out a tiger from 2k meters yet I have to pray the shot actually doesn’t just vanish on the damage display.