My church has 26 Source 4RWD II fixtures being powered by a sensor rack loaded with D20 modules. The fixtures along my FOH 2 pipe will flicker at low levels. The fixtures are set to DMX for dimming and we set all the D20 modules to full using a group on the Chamsys QuickQ 30 console. The DMX is terminated and it is not even every light or everytime. I would be open to any suggestions.