Walk Cycle Body/head bounce

Have a character walking and it generally looks OK. What I am trying to achevie is to reduce the up/down body and head movement and can't find which settings to adjust to make it less... Stomping/Yeti-like.

So the head would move less up/down during the walk cycle, and be a little more "graceful". I've been moving the various tags around and adjusted stride length and speed but none of those seem to have any effect.