As much as I hate to resurrect a dead thread, I dont feel that the answer was ever clear as to your problem. So this is for anyone who will read this in the future.
Those plants are in severe need of Nitrogen, flat out. I had the exact same problem running the lucas formula(which i now know is deficient in nitrogen).
While vegging i had great roots but all the leaves were drooping and curling under, super slow growth very short inner node spacing. You can also see that your lower leaves are lime green. Nitrogen is a mobile nutrient which means it will pull from older leaves for new growth, it also dissipates with water, and will dissipate faster with too strong of light (like you have) and CO2 will also speed transpiration further dissipating nitrogen.
I Switched to swerve's adjusted lucas formula and my plants took off. Now, I was running an og like swerve so his recipe worked for me. But I would use it as a basis to start from and dial in from there.
