I know that lifters on binding are for like better leverage.  I dont have them on my park skis(trouble makers).  I just won a pair of pbr brewskis that are k2 obsethed's so that will obviouslly be my powder ski.  Should i put risers on those bindings.  The skis are (138/105/125) size 179.  any recomendations on where to mount.  Im thinking standard