I just finished a grow using Fox Farms ocean forest soil +20% perlite, followed and used FF feeding schedule, and added 1/4 tsp. of Humbolt Hydroponics "Gravity" (wks. 7&9).
I also tried LST. Tallest plant at harvest was 17 1/2" from soil to top. Average weight per plant was just over 2 1/2 oz of dry manicured sticky bud (Purple Grand Daddy)