If you need more pics I can do that as well. I guess I should examine the tips to see if there burnt. If there not burnt that should mean its not a lockout issue correct?
There are two things you should figure out before you gonna talk about “lockout”. First is your light, being sure they are not getting stressed by too much light is crucial first step. This does not need to be visible as light burn or bleach since we are not talking about hot spots but about overall DLI they recieve. Sometimes the whole plant issue is just hidden in this “small” mistake. Than another important thing is temperature in the root zone. Optimal range for nutrient uptake is being consider between 18-22 Celsius in the rhizosphere, I have noticed when they drop under 16, than plant starts to show slight deficiencies in macros NPK. We are talking about average values, so if you run LED and have ambient temp max 22 than you are balancing on the edge and this can be source of your problem. Than lets talk about medium... did you ever ask yourself, why they come 5,5 pHed out of bag? Why they did not added more lime to make it “ideal” 6,5? I did and also tried to pHed it to 6,3. Believe me it definitely does not work like that! Beside that calcium messing everthing around ended up flushing with citric acid to kick them back on track. These mediums are made pH 5,5-6,0 for best nutrient uptake. Amount of added DL is also limited. It is not about too much calcium or magnesium for the plant since breakdown of dolomite lime is 2-3 years, but its about things and reactions between medium and salts in fertilizers (ofc I know nothing what is exactly happening there but know it wont work) which can lead to completely imbalanced medium. Another thing is fertilizing and watering. For me works best one thing. When go only water, then I do no runoff. When I feed than I have nice regular runoff. I give 7L and I get 1L runoff measure its EC for check if its not skyhigh and than wait untill it completely dries and water here and there when the pot feels lighter. But important is observe your plant for EVERY strange leaf behaving or discolouration. Trick is giving her nothing untill she really say something, than you can easily figure out overfeeding, salt builtup and other things connected to this. Than you know your light is OK, temp, you do not have bugs and you give food and she is happy. Than it becomes a routine and you will exactly know what to do. Burry the schedules and not needed suplements and boosters and go just basic. Keep your plant happy and not push her hard. A lot of advices on getting higher yields is for top growers in top environment. Most of us and me also grow for ouselves and its kinda hobby. I am growing in not such ideal environment and getting kinda lazy. At the end need to say that I am not an expert and somebody can disagre with things I said. It does not need to be true and I can be wrong. Its just things I got learnt growing plants in peat based mixes, no coco no hydro so basicly I am just a noob. There are muuuuch knowledgable guys who can maybe give you better advices. Good luck bro!