With clones most of the time the nodes are not even. When you top you will not have 2 nodes paired up on top. Since they're uneven, take the top node and tie it one way. The next node tie another way, same for the third. You can go to the fourth node but it's optional. At this point you will have 3+ nodes. You can let them grow and top again or keep stretching flat and just clear off a few nodes for a nice canopy. Hope that helps