They really don't look that bad, I have several indica dom strains i run that kind of flop like that as soon as the leaves get big enough to be heavy. N toxicity can cause the leaves to look like yours as well but I don't want to say that's definitely it because to me they just look like the soil is hot(nutes) or has salt buildup. I would feed with just water until they bounce back to what you want them to look like. In soil, I do not usually give any nutrients until they are a little bigger than yours are now, most soils come fertilized so it's an overkill to give them nutes for the first month or so. Definitely depends on the strain/genetics and how fast its nutrient uptake is.