as far as the lockouts. im 70% sure its the salts. some of the upper canopy stress was for sure from the light being to high.
i can visibly see the salts building up :/
and i was on 1/2 strength with these and they were all hungry so i bumped em all up and they loved it
a few weeks later and its creeping up.
no salt build ups on the pots that are top fed at all. and they are lush and green as can be.
even set up a DWC bucket with an auto for another trial with the nutes
so i have autopots, topfed and dwc in the coco
only the bottom fed gals have any issues. and it all seems to be shade leafs no bud material or sugar leafs. and bud production is still good enough that im not overly concerned

holy fork, it's goddamn green on top!

.... no bueno man.... the trick is that during earlier bloom stages, they do often love the extra nutes, but mid-late on, their needs drop off, especially late bloom... So more going in, less getting eaten = build-up....
It's the fans job to support the rest of the plant, which includes excess nutes... at the tips of the margin teeth (and the whole margin), there's "plumbing" that extrudes excess water (seen with guttation) which also will carry nutes like K+, hence the teeth burning...
What to do,... scrape the loaded shit off the surface for starters, consider flushing the pots if you're concerned about a clean finish..
Nanners may be from the stress, and/or in part a normal late survival thing, not uncommon.... Often I'm told nanner have weak/non viable pollen, unlike full-on male flowers that form at the nodes! Sneaky fuckers though; as much as I hawked my girls for bugs, mold, and pruned/LST, I still missed somebody getting jiggy wit' it on me last OD season! I'm finding the rare seed now and again in 5 of the girls, only that shitty Ice Cool (bad pheno) is clear I think... She has a funky-ass aroma and flavor, weak potency so I've not smoke much of her and explored... Most were in Pineapple so far, but between 1-6 seeds so far in the others. Some great crosses here, fem too-

, just no telling who the daddy was!