I understand your frustration but you can still get them back on track maybe

if it were something more destructive like completely yellowed or burnt leaves then it would be more of a problem but those leaves can still photosynthesize pretty well. It just shows stress on the roots, due to the transplants and probably wet for too long. I plant the germinated seed in my final 7gal pots, I water only near the stem when its small but when they have 2 nodes or so I do an intense watering making sure all the substrate is wet and then wait until the plants ask me for water. When the roots have not colonized all the pot is really easy to overwater your pot. Getting used to how much it weights when its recently watered and how much it weights right before watering is also a very good way of knowing but sometimes, like if you have a net, you cant lift the pots anymore so thats the safe route, wait for them to ask for it if youre not sure.