Wilted leaves seedling

Hey there ! Only one thing determines growth rate and that's VPD because it regulates the plant's metabolism. So you want optimal vapor pressure deficit, meaning in your case you want to raise the humidity to about 70% .... That being said there's something going on with the nutrients, quite simply you're seeing signs of nutrient burn, and also nutrient deficit. That's mainly because your pH is too high, you should be around 5.5-5.7 you're at 6.2 meaning the hydro nutrients are not getting absorbed correctly. If you dial these two/three things in the stress will go away and the plant can do its job. Hope this helps ! 🚀