My puppet does a downward slump when it begins to walk. I've checked all of my tags and moved some around but can't get around the problem. Also, when I select "run" the legs really get crazy so I'm doing something wrong but can't quite figure it out.
From memory the slump is often caused by the relative position of the head and neck tags. Try making sure head is directly above neck, and they are not too close together. E.g. put the neck handle at the bottom of the neck. Regarding the run, not sure. Try adjusting the strength settings in the behavior?