I recently installed a crescent shaped shower rod to eliminate the "attacking" shower curtain. It's been great and works well. However, the torque on the mounting hardware causes the shower rod to sag. I could install a chain from the ceiling to the center of the rod to hold it up but I would like to avoid this since I want to keep my existing shower curtain. Does anyone know how to prevent the sag? I've used toggle bolts to hang the hardware since they are the strongest mounting screws I can find.