I've never done a DWC cloner, unless you are talking about having some sprayers inside your setup?? I put the cuttings right into the 2'' net pots with the neoprene sleeve. Usually the cutting doesnt sit lower than the net pot, if thats what you mean?? I leave the sprayers on 24/7, but a lot of people do 1 min. on with 4 min. off to give the roots time to dry, grow and get some oxygen. Do you have a fixed cycle timer?
And if you are doing a DWC/Aeroponic cloner, im not sure what your plan is, but if you are going to transplant them in rockwool or anything, you dont want the roots getting too long. They are harder to transplant that way and can cause shock if you have to coil up all the roots to stick it into a rockwool cube. Again, I dont know what your plan is, so what is it and I might be able to help you out a little more