i removed the rubber completely,milled 3/8 off each cup,milled out the center section,placed rubber sheets i cut to cup size n between and bolted it back down.rides actually not bad.can get about a 1/2 more it seems from looking around under there.
im taking the running boards off this wknd and i have an ss bumper cover to go on it as well. jus have to trim the bottom of the bumper mounts since the body drop mashed the bumper up into the grille and light area.