Auto harvest 5 plants from seed

Ok so this week is been a nightmare. As I decided to L.S.T all the plants and it for some reason 3 stoped growing well very slowly and two other plants it looks like the L.S.T mite have worked but I still think they looked alot bigger and better all of them without doing the L.S.T I have switched all lights from veg to vag and bloom and raised the lights few inches more as I think they were given them light burn i have also just start gaveing them ph percent technology MICO, GROW, BLOOM 2mil each for one litre of water so will see if it helps also noticed some burn marks and discoloration on some leaves see photos two plants are just starting to go into flower with 3 not doing much at all from last L.S.T I have added before and after photos of L.S.T next time ill only do one plant in L.S.T for sure