White Widow med grow

Hello
Am growing a few white widow fems from seeds i bought from crop king. this is a led grow and will say led lights i have are very good and have been tested and proved.This is a organic grow in subcool super soil filling half of the 7 gal grow bags with super soil and top half with a quality organic potting soil with just perlite added.
Right from the begining all plants looked very healthy and around two weeks i gave a light feeding of 20-20-20.
Plant did very well and went back to straight water,and at 4nodes were topped and started to tie down.
After7 weeks transplanted into 7 gal grow bags and put lights on 12-12.Let me say that all temps and humidty are moneterd and controlled.My problem started around week three of flower when i made the decision to supplement with bud booster and all seemed ok until one plant started to spot and turn brown on shade leafs and bud leafs.Stopped feeding went back to straight water,but o late for that plant as it still progressed.One other plant showed a very small sign of the same but very slight.All other plant showed no sign.Fed straight water and i think stopped it but lots of damageEverything continued on until a few days ago when i noticed the other plant showing more signs of this issue and do not know how to stop kinda look like a mag issue so i suplemented water with cal mag.Just started week 6 of flowe and would like to stop this on this plant.All other plants look good just these two.Here are pics y

Nice lookin plants for led dude.

All i can see is a calcium def. if you've been supplementing calmag you're on the right track. They should finish off fine.

just remember the damage you do can't be undone. You overfed and stopped, but damage showing up after that is still the damage you've already done, just takes awhile to show. Back way off on the nutes but I wouldn't keep starving them. Looks like N toxicity starting to show, but they'll be fine. This late in flower you don't use 20-20-20.

only used 20-20-20 around week 2 of veg for one light feeding. Am in super soil and is suppose to be just water all the way through,was just worried my buds looked small

How far are your lights from the tops? LEDs have a tendency to burn and foxtail tops, but yours looks good. Looks so funk'n BOMB! Looks like its got another 25 days or so though. When I see dots like that usually means Ca def or I misted the plants with lights on.