PPM is roughly 350-400
The setup I have is like a clone x cloner where it has holes in the lid with 2 inch collars with a pump and spray nozzles
The difference with mine is that instead of the pump and nozzles I have a "pond fogger" for lack of a better description and a fan that blows the mist into the clone box
The setup is actually almost exactly like a high pressure fog clone box you could buy on amazon, and far more simple then you might believe.
My grow will also be aeroponic and because of that I cant use rockwool cubes as far as I know because they cause issues in the aero grow with PH and root rot. Its not complicated, and there are commercially available clone boxes that run on the same premise.
I need to see the set up and the mother plant if you want more than a guess.
I think the ppms are too high - drop to 200-250.
what nutes are in the thing?
and do you use a rooting simulator like vita grow rooting compound?? Look it up I recommend to use something like it, and not the gel or powder, and how long you dip the cut in hte rooting compound and how long you let it sit on the cut till it gets rinsed off is critical. its a liquid and that time is about 15-20 seconds or else you could fry the cut cuz its a hot product.
I think that the fan blowing into the box isnt needed and or screwing things up / drying the stem out even though its a mist maybe?
Water temp needs to be 72 degrees this isnt negotiable.
The funky light idk about that how bright and how far off the deck is it axactly, why not get a utility light that has areflective dome.shield and a spring clamp on it and a cfl grow bulb for it.
Without going around and looking at one of these things or yours it sounds like you dont need a humidity dome, it isnt that kind of cloning system, and your mixing cloning systems ...idk not going to reread all the post to find out if you had a humidity dome or not ...You dont use a humidity dome with the bucket and the water that spray up on the stems, you use a humidity dome for when you use r/w or peat pucks in a tray.