Those plants are definitely overwatered, or are drowning in a waterlogged medium. I know this because mine looked identical.. here’s a pic
You can see the swollen leaves, the blistery appearance, the hanging down droopy look. If you look closely you can tell that each portion of the leaf is swollen up against the veins.. it’s why your leaves have a 3d effect to them, mine did the same. It’s why our leaves feel weird and not smooth and soft. Its why every time you water they seem to droop for hours, even days afterwards. Mine did.. I was overwatering. You’re overwatering.. I was too, and I swore up and down I wasn’t. I was. You’re not going to overwater the plant by giving it too much water at one time. You overwater it by giving it constant access to water, I.e. you never let the soil dry out enough. You need a clear wet/dry cycle. It looks like you’re in plastic pots as well so you’ll be watering even less frequently.
You caught it yourself, you said “maybe I’m not waiting long enough” and that’s correct. I was watering every time the top inch felt dry and the pot felt light. That was killing me slowly, every 3-4 days. I didn’t quite realize how light the pot could actually get. What helped me was buying a moisture meter. A digital one that read moisture level. I used that and I waited until that meter told me the soil was dry down to the last inch of the pot then I felt how heavy it was and I was shocked at how mistaken I had been.
When your in veg it’s okay to let your plants dry out so much they wilt slightly, then water them. It’s beneficial for their root growth and will help keep so many issues in check. It will help establish your wet/dry cycle and you’ll be able to start zeroing in on exactly how long it takes your plant to consume it’s given volume of water. Cannabis roots are designed to pursue small amounts of water, it’s how they grow strong. You’re not making them work for it so they’re fat and lazy now and it shows in their behavior and look. Roots also need oxygen, which, when soil is constantly moist, they don’t have access to.
You don’t have a self built organic super soil that you’ve tended to yourself for years and understand intimately, and want to keep the biology alive and well. You’ve got commercially produced stuff like mine.. It’s okay to let it dry out really well a few times to be able to get your watering groove.
Overwatering will give you relentless issues that look like all kinds of wacky problems. It is far, far better to let the plant dry to wilt than to keep overwatering. Here’s how that plant looks now
They can be saved but you’ve gotta get your watering down.. I had to read Emilyas how to water a potted plant so many times to really get it
EDIT: Looking back through this post I see a plant that also looks exactly like one I overwatered too right here.. it’s creepy how much your plants look like mine did