Tiny it looks like you fixed the yellowing lower leaves BUT you didn't solve the problem because, you upped the N,I assume the whole EC. not just the N content. and then you added CaMg, SO what was it that was the cure???????

when I raced I learned the hard way (YOU ONLY MAKE ONE CHANGE AT A TIME) otherwise you haven't a clue what really made it go faster(slower in my case)
Daddy