i dont get it your juicing a 1000watts and your plants are not responding to it well your pots seem more then enough room, i have to ask how far is your light from the very top of the tallest plant?

a good trick is place your hand palm down under the bulb and move your hand towards the bulb until your hand is comfortable under it as close as you can get it with buring now put your plants that close to the light cause if i didnt burn you it wont burn them.

what ratio is your flower nute? (10-15-10)

how do you test the soil for dryness?