Make sure you haven't switched the primary and secondary shoe positions on that wheel. The primary shoe is the short one, and should be the at the front position. The secondary shoe is longer and goes in the rear position. The shoes probably are marked on the edges with Pri and Sec.
If the secondary shoe is in front, you will get more engergizing effect and the back shoe will tend to apply harder for a given pedal force. Beyond that, make sure the anchor pin is secure and the backing plate is tight.
Harvester
