A Tale of 2 Northern Lights Autos

Week 9 (Flower week 4). 01/23/2022: Day 59. I wasn't super enthusiastic to pull the plants out to check them over and water, feeling like there was some issues around either cal/mag or slight lock out...But when I pulled the plants out they looked pretty darn good. Snipped a few leaves that were ugly, but really not bad. -I've been watering 2g per 5g bag and decided to do a full look at the runoff PPM/EC to see if I was running into problems. My concern being the well water at 221ppm and whether that was causing trouble for P/K absorption. I checked run-off at 1.5g, 2g and then again at 3g (one gallon more than my usual watering). At 1.5g I had a PPM at ~850 (1.7ec), so not awful. At 2g (my usual full water) the PPM was down to ~675ppm (1.35ec), then at 3g I was down to ~500ppm (1ec). Good suggestion that its not lock out. -I've purchased a ZeroFilter and will be processing some of my water through, in hopes of pulling down my overall hardness, and more important using it to pull out sodium in the water that I've already softened. 1/27/2022-Day 63: -The two Northern Lights couldn't be farther phenos from each other. NL#2 has less stretch, but overall is healthier with better leaf color and less difficulty with what appears to be either a Ca/Mg or P/K issue. Last watering I checked for lockout (unlikely, since it had a EC of 1.7 at runoff), but in terms of tail-chasing for nutrient antagonism, I decided to try filtered water instead of our straight well water. This feeding I ran all the 'softened' well water through a ZeroWater filter to remove any remaining hardness but also any sodium left from the process. Initial TDS reads at 1ppm. From here I added Ca/Mg (supposedly in a better more available form than the calcium chloride that is in hard water, then nutrients. Ended up a little heavier than I wanted (around 730ppm/ 1.46 ec), but we're going with it. Hopefully it will clear up those paler green/yellow leaves and any of the rando spotting that looks like Ca/Mg issue. -ZeroWater filter will take some adjustment. Removing the natural Ca/Mg means that the pH lowers to around 5.2 meaning a good amount of pH Up is needed to hit 6.5. Will probably move to a schedule where I Ca/Mg the watering water and use minimal amounts in the feed water.