You are using a great nute program, I use the same
Now that I know your lighting, the only thing I can say is keep LSTing your next crop until you go to 12/12. I start LST when they are 6'' tall, I veg for 6 or more weeks, during this time the plant never gets over 8'' to 10'' tall, then I go to 12/12 and just let them go. As you saw in my log the plant remains compact and produces major buddage.