Inaugural Grow: Auto Northern Lights

NOV 9 (DAY 44): Since the TDS readings from my runoff were still super high a few days ago (1800-2300ppm), I have opted to do a semi-flush again today. Each plant received about a gallon of filtered water. The TDS readings from the three plants' runoff have dropped to 500-800ppm. Now that these fast maturing plants have had two semi-heavy waterings with the latest leading to runoff below 1000ppm, I'm not sure what to do. Should I do another plain watering? Am I getting close enough to the end that it's time to put away the nutes altogether? This may warrant a grow question. NOV 11 (DAY 46): I officially have no idea what to do with my comparison plant (plant 2). Its growth looks great, the buds are fattening up, and I finally got the TDS down below 800ppm after 2 heavy waterings. But now the plant is developing several different kinds of spots and colors that make me worry. Grow question time! NOV 12 (DAY 47): I’m trying my luck at feeding the plants again. This time, I mixed all the nutrients as per the FF schedule with a gallon of water, and then I diluted that mixture with filtered water until the TDS read around 800. This is when I figured something out. I added pH UP to bring the diluted mixture to 6.5, and that shot my TDS up to around 1200. I then diluted the mixture out again until the TDS read 1000. I will need to do more research to learn what impact pH UP has on solutions. Anyway, feeding as follows: Plant 1: 2400ml of diluted FF nutes, Cal Mag Plus, and Bembe (nute solution TDS = ; runoff = 500ml) Plant 2: 3000ml of diluted FF nutes, Cal Mag Plus, Terpinator, and Perpinator (nute solution TDS = 1000; runoff = 800ml) Plant 3: 2400ml of diluted FF nutes, Cal Mag Plus, trace Terpinator/Perpinator, Big Bud, and Bud Candy (nute solution TDS = 1000; runoff = 800ml)