Cant say anything about the Nutrients, pH looks totally fine.
How much u water? Do you give them enough that they have 10%+ runoff? Probably only half the pot is gettint watered if you dont do that. They underwatered if they drop 2 days after watering, overwatered same or next day. If you water with runoff, wait a day longer inbetween feedings.
If you are not sure, dont water them and check if its worse tomorrow, if you cant see anything, wait a day longer. If itts getting worse-underwatering, if its getting better-overwatering