this could be due to the holly wood style most companies apply to tigers and panthers, they where contrary to most thoughts quite simple to kill.
this was due to bad coupling on the turrets and the stress the tracks where under from the wight of the armour and awful housing of the fuel.
gemrman tanks hated russian tanks as if they tried to maintain the speed and distance the t34s achived the vehicle would become a victim to mechanical failure, to the degree many german tank drivers preferd captured uncomfortable rusian machines. when attacking german tanks in the war my grandad was instructed to cause mechanical failure in the tanks, so other men could then assualt the tank or starve it out or allow it to surrender. Trouble is that pre sherman it was thought the tiger was imune to tanks (not infantry)
problem game designers have is how do you get all these crazy varables into a game system, yes you could have infantry take out a tank, but then they would be able to take out every tank and become over powered.... or have wierd effects upon infantry for example....
as for the aircraft the subject of this post,,, it was called the tank killer and they wracked up a huge number of tank kills in WW2 !!! they where also known as the flying tank due to the armour that protected the pilot.
6's at the rear does seem a bit odd,, maybe its been read wrong or a rule has been missed ? without looking cant say much more than that to be honest.