please help save her

please help. my plants just keep getting more and more yellow, everyday i notice more yellow on the undergrowth. one of the oldest leaves just shriveled up and died, and another is about to. my two autoflowers, are almost 4 weeks old. this is my first grow and i got a little excited about the nutes and stupidly gave them some at 13 days, i burnt them. since then their health seems to go back and forth but now it's going really downhill. the crystal, my larger plant is very droopy, it use to be that she perked up a bit after a watering, but now, nothing. my smaller one, skunk #1 has some yellowing leaves but other then that she looks healthy and for the most part happy, just very small. i'm worried about them, i thought the yellowing was from the nute burn at first so ive only been giving PH water, but apparently that's not how nutrient burn looks. a couple days ago i started another forum and people told me that it was a nitrogen defiancey and she was starving, so i gave them both 1/4 of a gallon that had 2ml of BioMarine NPK 2-3-1 (recommended start dosage is 5ml), and it didn't fix anything. my soil is pretty woody, and i'm afraid some of her soil is staying moist while other parts are drying out very fast, like some sort of a drainage problem. i'm using new soil next grow and ive mostly came to the conclusion that this grow was a fail, but i still would like to get some buds because of how much i payed, i don't want her to shrivel up and die before i can harvest. here's some information, please help


germinated in soil.

up until 13 days old i was keeping top soil moist with spray bottle.


water schedule

5/7 - .5 gallon Grow 1.5ml BioRoot 1.5ml BioWeed 1ml CaMg+ 1ml Diamond Black 1ml


5/10 - .5 gallon Root 5ml Weed 3ml


5/16 - 1 gallon flush PH 6.0


5/19 - 1/4 of gallon PH 6.1


5/21 - 1/4 of gallon PH 6.1

5/23 - 1/4 of a gallon BioMarine 2ml (moistness meter was on 3, but i was told they needed the nutes)
i wait until my soil moistness meter is on 1 to water.

my soil PH meter says PH is at 7.

Whitney Farms Organic Potting soil(.15-.10-.10)

10% perlite

General Organic Nutrients: BioThrive Grow, BioThrive bloom, Diamond Black, BioBud, BioWeed, BioMarine, BioRoot, CaMg+

74-82'F

45-60% humidity

2.5x2.5 space

1 oscillating fan on high (they sway)

1 fan pointed at light

1 humidifier

400 Watt MH w/ wing reflector about 18 inches away up until yesterday, when i switched to a 400watt HPS w wing reflector, put it about 24 inches away, and i'm slowly lowering it.

here is the first weird thing i saw on her, small rusty looking spots on one of her fan leaves IMG_7845.JPG
it then progressed to this IMG_7848.JPG
and then earlier today, died.

this picture was taken 2 days agoIMG_7856.JPG
now looks like this IMG_7993.JPG
there are other leaves affected as wellIMG_8002.JPGIMG_8003.JPG
some more weird little marksIMG_8004.JPGIMG_8016.JPG
 
she has some very beautiful new growth coming in
IMG_7989.JPG here are some pictures of the full plant IMG_8025.JPGIMG_7996.JPG IMG_8014.JPG

please help me, i don't know if she'll make it.
 
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