In Malcolm Gladwell's book Blink, he has a study on how to determine if a patient is having a heart attack. It turns out there are really only a few things that matter and that the more information doctors gathered in making their decision, the more likely they would make a bad one. He gives many examples of the same concept, that too much information causes us to make worse decisions. What we need to make good decisions is big picture, not all the details. I think the more you measure all those small things the more tempted you will be to limit the gene pool much more than you should, and you will put too much emphasis on things that simply don't matter at all.