I believe those brownish leaves out of the colas are a phosphorus def

here is an example of one , & a shot of phosphorus fixed it
however you should complete a soil runoff test to be certain your not in lockout before you add anything



To rule out PH related issues complete a soil runoff PH test.......
with PH corrected water (6.5-6.8PH ) pour enough water in the pots so the water runs out the bottom of the pot ...collect & test the PH of this runoff water....