Good luck with your grow bro 🙏🤜🤛 you might have a calmag deficiency. Mine looked like that and advanced nutrients sensi calmag and their rhino skin fixed it in a few days bro.
Man if i were you i would not apply any heavy techniques , better make sure they start to be healthy, pink stems and leaves colour says you have some issues, try to sort them, girls still grow well without hard training.
All the Best !