hey NC'! .... looks like you got covered here well-
She's in no real danger, just a little "cooked"
-- yes on the lights up a bit for now,... easier on her for recovery, and the COB's are powerful... I highly recommend going to 20/4,... I know there's a lot of chest beating about this, but everything I see here and have tried tells me this is a very conditional benefit light regime (there's a few good threads here about this, Myth Buster section I believe)... I do see a lot of plants in here that are almost certainly getting "ridden too hard", and it starts to kick off a variety of potential problems...
--- MC is N heavy, and I see N tox' hit folks fairly often with this product... problem is, nute calculators are general guidelines, not always on point; as mentioned, different strains, even pheno's, can have variable nutrient tolerances and demands... N is something the plant will take in no matter what, needed or not... cumulatively, more gets in than what the plant can use and store, and ends up with N tox' (heavy bowing leaves, tip claw), and here, a general nute burn (tip burn)... Flush should have addressed that overload of nute salts... The leaves likely will keep some bowing by the time they harden off; it's a halting to progression that you're looking for....
Looks like you'll have to start preparing separate meals for the ladies mate!