I agree with Rich.
The plumbing is not yet efficient. The leaves dry up because they aren't hydrated by the roots.
Warm soil will help the roots catch up. Water will rot the roots.
Humidity above soil is all you can do now.
Before the leaves are full size, I wouldn't add any water unless the pots get really light in weight.
Try this-fill a pot, same size, same media as the ones holding your cuttings. Feel the weight when it's hydrated.
When you think you have to water your cuttings, check the weight of your "test pot" and dump the soil out of it. If there's moisture in the bottom half, it's not time to water yet.
If it IS time to water, try not to get water on the stalk.
Once you get two or three large leaves you can start to breathe a sigh of relief.
Stressful, isn't it?