Actually, there is a lot of literature that indicates the opposite. Informing people of bias makes them more susceptible to it (by making them better at rationalizing away their bias). And the backfire effect causes people to become more certain of wrong opinions when presented with evidence to the contrary.

The idea that intelligence produces rationality is a myth.

Sure, probably there is a valley.

But it'd be pretty strange that IQ would not correlate with real world adaptation efficiency. After all, intelligence is useless if you can't use it to better navigate the world, because it itself misleads you (then you are better off with just fight-or-flight instincts).

And probably tendency for rationality has a genetic component too.