Is this your first grow?
I'm sorry, but it just feels like we're not giving you the answer you want to hear.
I feel you're putting way too much thought into this. Maybe it's time to read one of many books on the subject and stop looking for confirmation bias on forums.
We told you what we thought you should do, with your limited supplies and resources, and the only thing I remember you doing is raising the light. Did you take the 300w out and put in something smaller? How close is the humidifier, are you hosing 'em? Can get a pic of your set up? I'm not a betting man, but I'd bet half my next check that your dirt is the main culprit. That and you fucking with them too much. But I'd like to see what you're working with.
Sorry if my post came off as whiny and not very well focused. I was in a terrible mood yesterday because the worse outlook on the plant.
So my supplies and resources are not limited, on the contrary I think Im getting my feet wet a bit to quick.
So to explain my setup I am practising in a closet right now while I wait for my location to be ready, right now I own 6 hps (600 w) lights and 4 CLFS (300 w) together with a tent and full "kit" equipment, however while I am waiting for the location I am practicing with 6 plants, where 1 did not pop out of the soil. 4 of these were planted 5 days later than the first two. The first two are the affected ones.
I threw away one of them today, the second one is not looking to well either as it has one of it's first true leafs fallen of, dont ask me how or when that happened I just noticed that.
I put average 5 hours per day on watching videos and trying to learn, and I guess I am not doing enough.. but yes this is my first grow and prior to that I have no experience whatsoever in growing, but not only that.. hand labour has never been my thing, I barely know how to make a cup of tea.. you could say I am a bit spoiled (I've worked successfully in tech field)
Now to the questions you asked, I've moved two of the small plants to a new soil (Gold Label Special Mix) and it feels indeed much more "airy" and fresh.. I moved two of them under the 300 w lamp with 30 cm distance to them, I kept the other two under the 100 clf. Why? Well I thought it's a good test to see if the if these two will go bad as well or if they will survive. The logic IM thinking, wich I have a feeling might be wrong is that I figure 4 plants will not do well under a 100 W CLF solely now that theyre growing a bit but I might be wrong
Together with these 2 lamps, that i unpacked from my big kit I have also setup a simple table fan (wich right now I'm keeping off) as some people said it could stress the seedlings.. I try fan the closet maybe 20 minutes far away to get some fresh air in there as I feel the air could be "stalky" and dead after a while in there, but additionally i have a small humidifier that runs 24 / 7 and makes the humidity range from 45-70 (depending if the big clf is on or not) I run the 300 CLF 20 hours on 4 hours off and the 100 clf i keep on all the time for the 2 small plants that are left. Oh and the humidifer i place about 40-50 cm away from the "plant table" ive made out of 2 boxes.
I will take your advice start reading some book, already planned to do so.. but I think i am putting alot of hours in and reading up, but as you can imagine the panic ordering all this equipment and I can't even get a simple plant to get into vegetative phase. Im hoping its related to the closet setup i have (wich is size of a small room) 1.5 m x 4 maybe so it's not supersmall.
I will try take somemore pictures tonight of the room to give you an idea what im working with right now.
Anyways thanks for your input and I guess ill be reading up a bit.