First of all your stems on the cuttings are too long. You don't need 4-6 inches of bare stem.
Also, you need cuttings with more intact leaves. Without roots a clone has to absorb water
thru the leaves. So get shorter cuttings and leave more greenery up top.
My clones stay in the dome 24/7 although I open the dome to spray-mist the clone leaves
2-3 times a day. Sometimes just misting the leaves will help the drooping.
I switched from rockwool to the larger 2-inch jiffy cubes for cloning. I want the pellet to be wet on the bottom half.
It's easier to tell moisture level in the cubes so that's why I switched. I place the clone stem halfway into the pellet,
that's why I want the moisture level there.
Finally, when you see the top of the clone dry out and wither to brown - toss it then. It will not recover
and you are wasting time to try.
BigSteve.