Might stop feeding and babying them for a while, now. Like you said, it's a natural process
I haven't fed them for 10 days now. That's why I'm surprised they're still so green. Just based on what others have said I expected them to start showing signs of deficiency. As I have never grown before, I'm simply following what most here have advised which is to stop feeding a couple of weeks before harvest. The reasons for this still puzzle me a bit, but I'm trusting the other more experienced growers.