Tie the motha' DOWN! when I top or supercrop I usually give them 3 0r 4 days before flowering them, just to observe and make sure everything is ok. As far as tying , go aahead and tie em all you want , all the way through. I tie them down at first ( the day I switch them to flowering), and then at about week 5, I end up having to stake them up because the buds are weighing them down to the point of breaking.