Help diagnosing deficiency

You sound like your in a pretty good place. The ec your feeding is a little high if your early bud. Older lower leaves will turn yellow and die. If the entire plant starts yellowing early, and your runoff ph and ec are good then there wanting a little more food. Early flower I run 1.2 ec in a week if I see yellowing happening I up my feed to 1.6 and run at that amount through mid flower, maybe 1.7 if they need that much. Late flower back to 1.2. Cheers