Tony:
The other two screws are in the other two kitty corners, the ones that look like there are no screws. The screw heads are actually underneath the pick up. To adjust, first loosen the top two, then, using a narrow blade screwdriver that fits into the holes, adjust the pickup height by turning the two screws under the pickup, and then lock it down with the two on top of the pickup. Unless there is something different about Epics of which I am not aware, this should work.
Bill, tgo