After the first defoliation the plant developed good. No sign of flower. So i decided to defoliate the plant. Because the bottom side leaves became not that much light. I read that the plant releases growth hormones to the shootes after defoliation.
I also switched the lightcycle from 24h light to 20h because i read that over 65 DLI on this 100% ~925 ppfd light dosnt get the plant any significant bonus in growth.