Sorry I may have misinterpreted 'watering'. So have you solely been spraying to just wet the top layer of soil? That could also be an issue if there's no moisture lower down but the top layer is moist all the time that's where the roots will stay. Not sure on your soil but on a few it's advisable to give the soil a good water 24-36 hours before planting. Are the pots really light when you lift them? Perhaps it is time to give them a proper watering. Hope they take off for you soon.