Those heavily damaged burned leaves close to the bud, inspect them wisely when harvesting. My suggestion is collect them seperately and dry sieve those triches.
I'ts not a big deal consuming them, as far as I know, they are not specifically toxic, smokers know the risks of smoking, these catechols just taste harsh when smoking. If I'd had nothing I still would smoke them, not buying from other.
If those chlorosis spots are induced by nutrition, what is most likely the case, wether it be defiency of excess, then these often cover the hole leaves, not just what you see in the light - it sometimes goes deep into inside the buds on the small flower-leaves and if you have big dense buds these small rotting tissue spots are high danger catching fungus, depending on how dense they grow, how strong the circulation ventilation is, whats the ambient rH temperature...
That's why maybe flushing and waiting several more day might not be a good idea, as this high likely raises humidity, too.
I would just harvest them. Still I think the flower-buds is excellent result, especially considering that damage with the leaves. Im enjoying them buds looking so great. Thats amazing. The plant dont mind the leaves too, it only cares for her fruits. Enjoy it! My criticism is not meant to undermine your good results, I just hope my thoughts analysing what might could have gone wrong with the leaves there helps you a little avoiding it next time.
Im experience with soil, Im not experienced with coco. With good soil you start with no feed (mineral) and low feed (organic) then start or increase it with the first since of defiency.... that makes finding out what it is a lot easier. Can't be excess, thats for sure. Defiency signs is reversible and under low-medium light intensity nutriants are not the limiting factor, so thats the safest way to proceed, slowly, calm with the wild horse, cowboy
. I think with coco you need to maintain generally a lower optimum PH and start feeding right amountsof minerals earlier, because there is no great ion exchange capacity like clays and loam have for depositing nutes, similar to hydroponic, you must feed or the soon run into defiency. Still coco can be strongly prefertilised for veg-stadium, Im not exactly sure about that, so don't mind me if im wrong. Im not a coco expert, sry.
Enjoy it! Keep growin'!