I fully believe you. I’ve seen your plants. My little girls have never experienced that high of a feed so it would worry me to feed that high. I put wood ashes and charcoal on my outdoor veggie garden during the winter and have no problems.
I have gone back and forth trying organic and not. I prefer the organic side for taste and i eat my plants so also peace of mind. If you use chelated salts then you will dehydrate your roots and not have the tiny micro hairs needed to take up nutrients. Switching back and forth doesn’t work. I am not a nute nazi and realize this can be argued for ever.
From what i read if you feed chealated phosphorus the plant doesn’t need mycorrhizae so it doesn’t give out the exudates that it needs so the mycorrhizae die out. @MiG