It is incredibly hard to hit a Tiger right with 5" rockets. You need to hit him from directly behind, at a very shallow vertical angle. If you're trying to dive on him steeply, you're not likely to be able to hit a soft spot. You're trying to hit the soft rear of the tank, where the engine and drivetrain is, where it is lightly armored and not well protected. You are not likely to knock his turret out or off with rockets.