As I understand it, the shoulder harness mounts should be 0-10 deg below the top of your shoulder as per any of the racing specifications. I'll probably have time to find proof tomorrow if no one beats me to it.
I stand corrected. I should have said "on a daily driver". If you were racing yes, because you want to be tight. In a daily driver, if it were tight and pulling down, it gets uncomfortable in a hurry. So you loosen them, then they do not work as well.


