To further test my 8-device relay I built a little LED flashlight like this:
But wired to NO and COM the light is off to start with and and only on when programmed (note the red lines above). Like these Python statements:
GPIO.output(RelaySw1,GPIO.LOW) # turn SW on
GPIO.output(RelaySw1,GPIO.HIGH) # turn SW off
Ok, so the LOW and HIGH still seem backwards. But I don't have to worry about the relays being all on at reboot.