ok now im no expert on growing, but i've grown before and i have become obsessed with growing. but why are u using so many god damn nutrients? to me it looks like nutrient burn.
you said you bring air in from outside so thats good, stop using co2 (if you are) fresh air from outside has plenty of co2 for your plants. other than that the only thing i can really tell you is keep the temperature down. good luck man.