All ladies looks healthy and should start streching soon so I would not worrie and you can start to give some nuts to help the grow ( EC 0.6-1 ). You can check if you light is at correct dinstance by checking the LUX
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 )
• Clone and seedling stage: 5,000–7,000 lux
• Vegetative stage: 15,000–50,000 lux
• Flowering stage: 45,000–65,000 lux