I'm losing my mind. For Panaflex flex face signs, how do you keep the bracing for the retainer from showing shadows on the face when lit?? It is driving me crazy. I have a 15' x 15' sign, that is 8" deep without the retainer. I have my LED's (modules) mounted on the back of the sign. What is the best bracing system for eliminating shadows on a flex face sign please?