Please help, first time grower! I think my plants have Iron deficiency / Nutrient lockout

Well guys I don't know what else to do to try and bring these girls back. I'm thinking of just cutting my losses and starting fresh.
I did a full flush and fed nutrients.
I fed at 750 ppm. PH at 6.0
Fed with Bionacare Grow, Cal Mag, liquid karma supplement

First runoff was 1500-2500 ppm PH 5.5
Second runoff was 1000-1500 ppm 5.7
Third runoff was 700-1200 ppm 5.9
All runoff from here on out has been stable at 500-800 ppm 6.0

To me the numbers have looked good for about 4 days now with no apparent improvement in the plants they just seem to get worse.
From what I found online plants look like they are experiencing extreme overwatering.
Do I just cut my losses now and start fresh do they look to far gone now? They are Autos so I'm down at least a week and a half already.

Those are not autos.
On the 15th when you started your thread, you said they were at 28 days when you took the pic.........that makes it over 5 weeks since the pic was taken.
Not sure how old they were when you took the pic.........but they should be showing pistils by now.
Next time don't use those dry amendments with coco.
Trying to fix a problem with all that crap in the coco is almost impossible.

I got them from ILGM, auto gg gsc and Bruce Banner. Only one plant is showing pistils. Could I have fucked them up so bad that they didn't even go into flower from veg