If you don't have a ton of roots everywhere. Pick up your rockwool blocks gently, not to crush or smash them, and do a lifting and droping motion to get rid of excess water in your blocks, let them continue to dry out a bit for a day, or two, or three, however long untill they have very little water in them again. Then mix up some new nutes, about 200 ppm, and water them from the bottom. thing is with rock wool, it holds alot of water. Your watering schedule is for hydroton pellets, not for rockwool. you might be able to get up to one watering a day, when the plants are like 3 feet tall. But more likely with those giant blocks, watering might only be once a week at first.