A few questions about watering & Light distance

Ok so first of all my setup:

Light - Lumatek Attis 300w full spectrum LED

1M x 1M grow tent

4 x 14L growpots

Can-Fan Max Fan Pro 615m3/h

Can-Lite active carbon filter.

Day time temperature is around 25-28c.

Night time temperature is around 20c.

Light cycle is 18/6.

Moisture levels were at 60% during very early seedling state and now i keep it at 40%.

I have one clip-on fan gently breezing above them all just so the stem can get nice and thick early on. They are not dancing in the wind or anything.

Soil is only Bio-Bizz all mix, didn't have light mix to start out with.

This is my first time using a LED light source by the way. First time doing autoflowers too.

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So with that out of the way, here's the situation. Got 4 Special Kush autoflowers at 3 weeks old.

Been very healthy looking up until two days ago, and by no means is the situation critical yet.

The leaves started drooping a little after 3 days of not watering, (This is when i usually give them water, which has worked perfectly fine with previous grows.)

HOWEVER this time the leaves didn't perk up like they usually do. I also noticed a tiny bit of yellowing on the edge of one fan leaf.

I had completely soaked the soil 48h before planting the seedlings in, which might have been a mistake because Bio-Bizz allmix has some nutrients in it which activate when watered. (Not good for plants too young. As far as i know. Not an expert, only done a few grows.)

Last watering (two days ago) i gave them an approximate of 1L per plant, after checking that the soil was still moist at 7cm deep. Also checked the bottom and the soil was moist there too.

So, i have narrowed the source of this down to 4 possible things:

1: The nutrients in the soil might have caused nutrient burn?

2: Under watered plants (This i think might be the most likely one. Though as mentioned, the soil seems to be moist both in the bottom and top.)

3: Over watered plants (Doubt it's this though. Been very careful with it.)

4: The light might be too far away? (Currently the lamp hangs at 35cm from the top of the plants at full power. Moved it down now from 50cm since the third set of fan leaves are here and i am confident that the plants will be able to handle it and are in full veg mode.)

Any ideas why the leaves would be drooping like this? Plus the small bit of yellowing has me worried too.

This might be a fuss about nothing at all, but this is new to me. I just want to prevent any serious issues before it's too late. Might even fix itself within a few days.

Pictures are taken 9 hours into day time cycle by the way.

Thanks for the patience. Cheers!
 

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To add to this: I have not given them any additional nutrients yet. Only what was in the soil to start out with.

Plan was to give them their first bit on the next watering but not i'm probably going to wait two more waterings (one week or so) to do it.
 
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