Mine get around 3 foot tall. They're real bushy until they start their natural stretch after a good month or so of growing. They will literally stretch an inch or two a day for a short period. I will start moving the light up after the plant starts its flowering stretch to encourage it a little more.
I try to keep the LED in the sweet spot by watching the plant. When the leaves are all arched up wide open, that's the sweet spot.
If the plant is real bushy to the point the bottom nugs are running way behind then I do a staggered harvest. I cut off what's ready and will let the rest go a couple more weeks. That's how I pulled 150 grams trimmed and cured off a Sweet Tooth.
I don't do much if any LST. From time to time I'll spread the plant out a little with some round bamboo stakes but that's about it. I'm just a personal stash guy. It's more about quality than quantity but I do get good quantity.