Looks like your light could be too high but you put 30cm which is fine. Keep doing the LST and should be fine but check the light just in caseš
Get free APP to measure LED Lux ( https://play.google.com/store/apps/details?id=com.doggoapps.luxlight&hl=en_GB&gl=US&pli=1 )
Light
ā¢ Clone and seedling stage: 5,000ā7,000 lux
ā¢ Vegetative stage: 15,000ā50,000 lux
ā¢ Flowering stage: 45,000ā65,000 lux