What do you think about the way the leaves looks?

For hydroponics an EC 1.8 at this point of grow and PH 5.8, also i think you could use Iron as foliar spray weekly- Plagron Vita Race (1ml/L) or even better Magnifcal from Remo Nutrients also as foliar spray weekly (1ml/L)or direct into the tank 1,3ml/L

They look fine to me. Well some pictures looks like the plant might have some kind of interveinal yellowing and minor clawing. Try looking at it (and taking a picture under natural light. Is that what you are worried about? I think you might have some kind of minor micro nutrients lockout. Excess P or K, locks out many secondary elements like calcium, magnesium, zinc, iron. You might want to keep your pH in 5.5 - 5.8 range, not that 6.2 is bad, but is not ideal. Also for a plant this young, 2.1 EC is kind of strong, that's for full flowering plants. I would dial back the solution strength to 1 EC and ramp it up slowly, but while in veg, don't go over 1.4 EC

She looks stressed from too many nutes ( clawed leaves) I’d cut the nutes back a little also see if you can either increase the air or run your pump a little less often as the leaves are pretty puffy

Your leaves are fine, you’re feeding nutrients. No burn. Temps and humidity are ok along with everything else. Your leaves will look more like cannabis leaves as your plant gets older and matures. Nothing wrong, give her time and your leaves will get bigger and expand. Hope this helps