Judging by all the weeks, it is very difficult to tell the reason. your conditions are good. if everything is as stated above. temperature. humidity distance lamps. the only thing that worries me is the amount of watering. I think 0.5 liters per day is too much. also the main problem of why they do not grow. (grows badly slowly) may be in bad soil. has it not become hard, dense? the ground should be light, airy and soft. if the soil is dense and heavy and watering is still in such volumes. I think the first thing you need to do is wait and let the soil dry out. then, when the plant needs watering, give it basic fertilizer for the growing season.
if you use Jungle Juice then go to the my page and see the doses that I use. I use Jungle Juice on all new reports.
I would advise not to do LST yet. untie them and let them grow stronger. you will feel when they begin to grow actively and LST is needed! and now you just torture them ..
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