Mist the lid no more than twice a day for now and remove the heating pad. If the rockwool is soaked, gently squeeze out as much moisture as possible. You want them moist, not drenched. If they bounce back, you can re-introduce the heating pad, though you'll have to decide whether it's even necessary.
When you say "now they are in a humidome", does that mean they were not before? Keep that thing on. Also, it's very possible the fan leaves are too heavy. I obviously can't say for sure because you didn't provide pics.