The burly mix we usualy use is chopped up weed and sand and make it a rich mix of weed to keep the blackies around. Before we start throwing burly in, we always check to see which way the drift is going for our floats then chuck a couple of scoops in up past our floats so it keeps our floats in the strike zone with the drift. If you chuck the burly down past the float you end up taking the fish away from the strike zone. When burlying, don't throw to much in, just enough to keep them interested maybe a couple of scoops every 10mins or so.