Help w/diagnosis? pls

Hi all, need help! plants 21 days old now. Main concern is this plant which is almost hugging herself she looks so sad. Is this over/underwatering? In coco with a small amount of perlite mixed in. Started in 15L autopots, which I'm going to turn on soon probably, as heard many bad things about transplanting autos and had a bad experience with it last grow.. would this also explain the slower growth (the large pot/small plant)?

Environment is not ideal, running temps 26-29c ambient and 30-32c under the LED as experienced by the plants. Humidity is 35-45%. Small space (60x60x140) and trying to run 2 LEDs for 3 plants. (1x 240W and 1x 190W)

Had this problem for a couple of weeks now and I can't tell what it is, had lots of advice on here which I'm grateful for, but the problem still persists! I don't want to risk giving her a lot of water and worsening the problem. It's interesting to note that her growth has kept up with the other two in terms of leaf development and height, it's just the plant looks so damn unhappy...anybody got any ideas as to why?

After taking this picture I did give her 100ml or so of water and a small bottom-feed and will note if she looks any different in a few hours or in the morning. Still, would be great to get some opinions.

Cheers

Possibly under watered. Is the ppm and ph good?

I'm guilty of not measuring my PPM or run off or anything try and just use the tips of the leaves to tell me when I'm using too many nutes, but try to only use nutrients every two or three waterings. Ph is always good, between 5.7-6.1 usually, but I do use a strip and bottle indicator so it's not the most accurate but used this method last grow and didn't encounter any PH or nutrient related problems!

What is that soil you are growing in?looks like back yard dirt.Looks like overwatering or soil compaction.

using a mixture of coco, clay pebbles and perlite mate