Big fish eat small fish. Anytime you can present an a rig is a good time to fish it. Arig excels in structure fishing not cover(Ledges, channels, ridges, dams, Creek vends etc. Not pads docks timber grass. That being said I have caught fish on big spawning flats ready to pop. IMO.! Regards, dumb ol boy from Texas that snags a good one every now and then.