I grow in a hempy bucket and I use it day 50-53. 3ml/gallon with a pH 6 water and minimal flowering nuts. Then it gets flushed for about 2-3 days and then no water for 2-3 days so the plant dries some on the vine before harvest. I also use overdrive from day 42-53. I mix up a new batch daily as it 'foams' if left in the rez.

Worth the $ and time. I definitely notice a yield and density increase, especially on leafier type flowerers. Never noticed a taste difference. Never noticed headaches. Ive never moved the lights up but I have a light mover and I usually stretch out the move distance on that last week, perhaps that helps.