You have got it right by pulling it down, but I would be leery about snapping the main stem though with such a large plant. LST will work, but recovery time might be an issue if you do snap the main stalk. I would brace it so it will not snap, especially when your bud forms with the added weight. I would use progressively longer stakes to support the top and to hang your branches from, just to play it safe. Nice plant, you should pull at least 2 zips. Peace