I have been growing hydroponically for a couple of years now and I just can't produce enough product to last until my next batch is ready. I usually have 4 plants ( clones ) going. My grow room is a 4x5 ft. closet. I use 2 - 9" x 16" LED 300 watt, 50/60 Hz lights,. I use technaflora plant food nutrients, the p.h. in the water is dead on. the humidity is 50% and the temp is 79 degrees. and I have a small fan blowing over the tops. The flowering lighting is 12 on & 12 off and the veg lighting is 18 on & 6 off. What am I doing wrong? I would appreciate all help, thank you.