I think the relationship between social-dominance orientation in people and the extent to which they're made uncomfortable by ambiguity and novelty is really important. Better a stable world that's familiar, in which I'm doing pretty poorly, than dealing with all the ambiguity of a changing world.
I expected social rank to be the determining factor in health, and in some ways that's true. But far more important is what sort of society that rank occurs in. Being low ranking in a benevolent troop is a hell of a lot better for your blood pressure than being low ranking in an aggressive troop.
Successful stress management heavily revolves around combating the building blocks of psychological stress - a feeling as if you have no control over the adversities in your life, a feeling that you have no predictive information about the stressors, if you lack outlets for the frustrations caused by the stressors, if you have no social support.