It could be your ph in flower if its not right your plant won't take up the right amount of nutes usually keep ph in a range of 6.2-6.8I have been having to use ocean forrest soil this grow. I usually use dr. Earth or coast of maine. I run them under led lights and use grow big and tiger bloom/ ca,mg. Of they show signs of needing nutes like yellowing or other deficiency I try to give them nutes. Maybe I am over compensating and over correcting?
I've noticed plants in Veg are less picky with ph then ones in flower and for adjusting soil ph I'm not 100% sure but I think if it's to high you just water with a lower ph till there is some run off of the water. You would need a soil ph tester.Be ok* in veg sorry about auto correct