Lemon Haze Auto

finally got my ph solution with digital meter and some Grow Big by Fox Farms and everything is looking pretty good. I'm not sure if the plants are starting to naturally stretch or they are so happy because of the nutes and ph'd water ( my tap water PH was at 8.8! ) because the largest two literally grew an inch in less than 24 hours after watering and the largest started flowering a couple days ago and it has about 4 times the pistils and bud sites. I am still wondering how tall the largest one will get, it's at day 28 from sprout and only about 8 inches however very bushy. the smallest plant that looks bad is actually as old as the largest. however during transplant the rootball came apart and the plants roots landed somewhat sideways in the final pot, then i overwatered it :S so i topped the runt because it finally started growing new leaves quickly and i want to salvage what i can. I am also wondering if it's too late to LST, I've been scared to since this is my firs time, however I've been leaf tucking which has been quite effective. I just want some more height and to maximize bud sites. the pics the white spots are water stains not deficiencies, gonna mist the leaves with weak vinegar solution to make them look pretty. let me know what you guys think!