I had the same thing happen to me..
I, in a stuka dropped a 1000kg (@2200lbs!) on a tiger and it didnt even lose its mgs! it kept firing both shells and the top mg.
I then dropped 2x 250kgs (@2x550lbs) and even saw one of the bombs strike with a hit flash!
again no effect it seemed.
Either theres a bug or this is how the tigers armour is>
I must say I do want the Tiger to be formidable, and very good at stopping AP shells.But what i dont want is this totally unrealistic survivability in huge HE explosions.
If you ever saw the films of the Tigers which were bombed in Normandy, you would know these tanks were 'blown into the air like matchboxes' (quote from a german POW who witnessed it)
Well i think a 1000lber (or even a 500lber?) would do just that to Tanks. They should at least take massive damage to tracks or the gun right? if not blown over and totally destroyed?
Would it be possible to make tigers more vulnerable to large bombs without reducing its durability to AP shells fired from vehicles?
I dont want to drive a supertank in AH, just one that is accurate to the real world physics.ie it gets hit by a large bomb and its all over!. Although, i still want to have a few 75mms bounce off my turret

so is it a bug or the DM?