I think you are missing the point OP is making. The top 80% of blacks score well on the subjective stuff. Only the top 10% of Asians score that well. With that, there are a few possibilities.
1) Blacks are more interesting than Asians.
2) Personality is uncorrelated with test scores.
3) Harvard is purposely scoring to change the racial split of the class.
Of those, I think 3 is most likely. I am open to discussion but I think Harvard is to smart to be doing it on accident and the racial split is to politically acceptable to be by chance.