Is (IQ * hyper motivation) an evolutionary strategy that is epigenetically activated to compensate for poor genetic symmetry expression during gestation?
...
Poor genetic unravelling and high copy error rates cause physically unattractive faces/asymmetrical/poorer physical health/physical quality in combat which lower mating choice and competitiveness.

It comes with a huge cost to push the iq over two standard deviations so it doesn't make sense that it would be optimised for by default.

So it has been selected for selectively, lying dormant until it's triggered epigenetically as a compensation strategy.