Glad to see you are up and around Emilya. I appreciate you sharing your story about your virus experience. Colds seem to go right to my lungs and I am 60 so I appreciate the warning. I am basically self-isolating as much as I can till they get a vaccine or things are under control but I think I have a very long self-imposed exile either way.
I didn't want to bother you while you were convalescing but I have been applying your methodologies using your theory that excessive MC causes a lot of lockout. I was being pretty conservative keeping my MC to 5.5 g per gallon in the first couple weeks of flower but then I started adding .5 g per gallon of BE and SW which I know is too early according to your experience.
I got a few yellowing lower leaves with some dark blotches and heeding your advice that it is probably lockout in my subsequent watering I cut out the BE and SW but I did raise the MC to 6 g per gallon and miraculously three days later no more bad lower leaves.
It's still early in the game but so far using your methods of keeping MC within the manufacturer's
guidelines and keeping additives very moderate later in flowering my plants are looking really nice. This is what my leaves looked like when I think I had lock out. This is always what I get near the end of flower with my lower leaves but I seem to be doing better this time.
In the past I have felt like a drunk trying to thread a needle with my MC application because I was swinging wildly in dosage never hitting the sweet spot; who knew following the directions was the answer?
In a few waterings, I am going to introduce .25g/gal BE and SC.