Some integrated hopper circuits do not act according to the vanilla hopper mechanics with spigot. I changed hopper-check in spigot.yml from 8 to 1 and my machines (e.g. an auto smelter) worked as they should. I'm unsure of whether that value should be 0 or 1 though. Is this intentional? If more info is needed, I can provide a world save to demo the bug.