I feel for ya! I'm sorry that this kinda turned on you. It may be because of the transplant. Some plants are hardier than others. I have gentle hands, and rarely have a problem with transplanting. Did you try taking the MG soil off of them? That's the hardest thing to do I know, and it requires an almost surgeon like hands. They may be in shock! Don't give up on them. I'd let them just chill out for a few days and see what they might do. Water normally. As you stated you've watered them well enough already. Don't jump the gun and say they're dead yet. Cannabis is a very hardy plant.
Stop watering them, and put them under good light. They may pull through for you.
Stop watering them, and put them under good light. They may pull through for you.