Keep clone enviornment humid, but don't spray the clones directly. The idea is to make the plants find their moisture/nutrients in the soil, (Rockwool) not to continue vegetative growth of the canopy. If you are providing all of the clones needs above ground, there is no incentive for it to develop roots.

Be careful not to dry-out the clones when 'airing-out' or giving fresh air. Too dry, and the leaves will crisp-up.

Keep clones warm. Cold will kill as quickly as drying-out.

Rockwool is acidic, and should be rinsed with properly ph'd water prior to use. Keep it moist without keeping it dripping wet. Transplant when roots start showing, but no nutes till third (or so) new node after transplant.