Leaves turning BLACK, twisting and curling. Can anyone help? >.<

Hello folks, I don't know what kind of leaf problem my babies are going through so I decided to reach out to my favorite community for some help.
So my babies are in 7 gallon pots, 70/30 super soil potting mix and perlite. Fed every 2 days with some flora grow, micro, vitamin b-1 in Ph 5.7 water (little over half strength, Mixed 3 teaspoon each of grow and micro, 1 of the vitamin b-1 in 5 gallons of water).

A few days ago i saw webs on one of the plants so decided to spray them with a mix of neem oil, hydrogen peroxide, and water. I mixed about 3 teaspoon of each into a liter of water, idk if the concentration of the h2o2 mightve been too much, but that shouldnt do anything to the plants.

Also, lately i've been trying out spraying them at dawn with carbonated water, they dry out before the full sun hits them. I use Arrowhead carbonated water to spray them, no flavors added to water.

Only parts of the plants are affected, and the leaves gets soft and black first then gets all crumbly after. .I'm clueless as to what is going on; any help would be greatly appreciated. Thanks! =]

they look over watered

before u water and feed, lift the pot. if it feels heavy, it doesnt need water, if it feels real light, it does. use the weight of the pots for your judgement call on wether or not to water from here on out, not by looking at the surface of the soil. the water sinks down into the bottom of the pot and often times it's hard to gauge if you need to water or not by examining the surface. hope that helps.

I'm really careful about watering, I only water whenever the pot feels light and thats every 2 days. I do lift the pots up to check, so before i water the pots are almost bone dry. so i dont think its a watering issue =[ Thank you though.

I use 2 tbsp of neem and a few squirts of ultra concentrated dawn dish soap (non-antibacterial) per gallon. It is really gentle and I use it on clones with no problems and it works great for mites. You will need to reapply every 3-5 days for about 4 times to do the job.

I would also try for a ph of 6.5- 6.8 if that is soil. 5.7 is too low and you are probably locking out nutes.
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I think you are right about the h202.

I've been doing 5.7 the whole time cause thats what i do for my hydro set up xD, I will aim for a 6.6 from now on. Also, I've tried dish soap before, but it kept coming back, i'll try it with a more concentrated mix.

Heres a couple more pictures of the plants. It seems that they are getting a bit of nute burn.. Idk how this happened cause I'm barely doing half strength for them >.<

If it is the h2o2, is it going to affect the whole plants? I'm about to trim the bad leaves to see if the problem spreads. I already sprayed them down with water the other day and did a round of flushing, so whatever is built up on the leaves and soil should be out. Thanks for the help!!

I'm having the same problem sprayed with neem oil leaves drying out, like they were in an oven. Did you ever figure out what it was

I would lay off the carbo. water for a while, and like Opm said, 6.5 on the PH.
3 tsp of neem in a liter sounds like too much........ https://www.rollitup.org/newbie-central/355832-how-much-neem-oil-per.html
If you apply too much, the leaves can't 'breathe'.
When you water, do you give enough to get runoff or just wet the top of the soil?
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those are clearly oil burns, when u spray them u need to always shake ur bottle or else it seperates in there and ur hitting them with oil directly. Takes them about 2 weeks to recover from that.