Those look exactly like my Sour OG plant's after I flushed for a few days without any nutes. And I still regret it, I had to install an A/C to get them to start to recover after the flush. They just couldn't take the 80-88f temperature anymore. After that, I added B-1 and a big phosphorus boost (all from MOAB by Mad Farmer) they have started to recover and have gone back into full bud production.
That purplish discoloration on your leaves that starts in the middles and goes outward is a phosphorus deficiency and those leaves will stay like that even after you fix the problem. But normal growth should resume with a normal color. Just cut off that other leaf where it looks like the tip got dipped in the deep fryer, it is just going to get worse and die. I have tried just cutting off the messed up part, but the problem doesn't stop, the leaf will continue to die, and sap precious energy away from your girls
Starting with a weak feeding is was a good idea, I'd bring them up slowly and then blast them as long as possible. Doing a 1/4 strength foliar spray is also recommended with all your nutes that state they are capable of doing so. Or at least some VermiT, which can be picked up premade in a fridge bag at a Hydro store or in concentrated do-it-yourself bricks. You can use that in a foliar or root feeding at any stage of growth, and it's like viagra for your plants! Highly recommended. Mix it with your organic mix. But beware, it'll sour in 24 hours if unfridgerated, sometimes in 48hours, if temps are good. But be careful. If left in the fridge it'll last a week, these same rules apply when it is mixed to your nutrients, and sour nutrients could kill your crop in your sleep.
This is my best advice for you. I just got over this hump and resumed normal flowering growth. It set me 2 weeks back during my 9th week of flowering. It's what I get for flushing so late when changing my nutrient feed as well as flushing some early finishers. Stupid beginner move, or possibly weak genetics.