How much dry weight are you trying to produce every ~100 days/per plant?
That’s a powerful light…what is your PPFD for the 18/6 (we can figure out DLI with those numbers too)? You may be a little high for this stage.
What are your Day/Night temps in the tent?
RH is currently a little low…you should get that into at least the low 50s% for now by whatever method is convenient. There are charts to look up to get more specific. The RH should have been much higher in your previous weeks which may have stunted your folks a little, but they could surprise you.