and there are more high showings too, which makes your reference to low showings biased and dubious.
also, the nuclear bombs still have a ridiculously devastating impact on the planet. it is the radiation from the blasts, not the blasts themselves, that empowers him.
there are examples from way back of Hulk being attacked - and harmed - by a character only to amp so much that a second attack of far more intensity and power results in no damage whatsoever, due to the dynamic amping of ALL his stats.
moreover, there's Wolverine commenting on how Hulk's durability increased so much that his Adamantium claws couldn't cut into him.
and the fact that when General Ross shot him, point blank, in the eye with Adamantium ammo, the bullet just bounced off of Hulk's pupil - no effect whatsoever.
again, you are basically denying a fundamental, well established part of his powerset.