Hello mate i have just grew this strain myself and also had crazy stretch from the plant im no expert but my advice would be switch your light to 12/12 asap from 18/6 and should hopefully stop the stretch and concentrate more on flowering, my tallest reached 142cm i had to get a bigger tent, 2nd grew to 120cm 3rd was not to bad at around 95cm, looking well though so far mate good luck
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