3 identical plants, 3 separate issues... Help?

Oh... Tangerine Dream!! I grew this and it was quite the experience! I think you're getting good terpenes on all of them but I DO worry about the first two - showing definite signs of what I believe is a calcium deficiency.... Now I know you're going to say that all three have received the same nutes but that doesn't really make any difference - each plant responds in their own way to what you give them - right now, for example, I'm growing 4 Blackberry Moonrocks... one of them is going through 1.25 gallons of water every day... the other three only need/take 3/4 of a gallon... that one lady is just doing things differently - and you have to listen to them! Your PH is spot on so I don't think that's the problem... I'm unfamiliar with your nutes but if there's a lot of nitrogen in them, nitrogen can cause a lockout of calcium. I see you've been trying calmag... if that's working (the damaged leaves will NOT get better no matter what you do) and the problem isn't continuing to get worse, then you've solved your own problem.... if it HASN'T solved the problem, I would consider doing a flush (run 3x the water as the pot size - so in your case, you'd run 6-7 gallons of ph'd water through each pot) adding in 1/2 strength nutes to the last gallon. Let them dry out completely before watering again. This will clear out any nute or salts build up in the soil and you can go from there... If any of your nutes have a lot of nitrogen in them, I'd cut them by half permanently... You've got several more weeks to go so this is definitely worth doing IF the calmag is not working for you. Best of luck.... you'll enjoy the smoke!