These plants are feminized white widow growing from seed under a 600 W HPS I flushed soil like 3 days ago and there hasn't been any improvement.
The fourth picture makes it look like magnesium deficiency to me..use either epsom salts @ 1tbsp per gallon of water or cal-mag 1/2 to 1 tsp per gallon of water. In my opinion every grower should have a bottle of cal-mag unless they're growing organic.