No you don't tie down the individual leaves. You have to tie the branches down if you doing that. Or the top of the whole plant. Pull the whole top down about 2inch under they 2 nodes on the top. Then when they grow back up you can do whatever, tie them 2 new heads down to the other side or work the plant into a circle , many ways of LST a plant, have a little read. Have you moved the lights closer?