I realized a few things that might help you.
It's better to have more misters than not enough.
If you ever try to make one, when you drill out all your site holes make your manifold to suit all your sites.
180deg misters for the perimeter, 360deg misters for inner.
Water pump is quite important, you want a pump that can move around 660gph or more.
You want instant spray the moment you turn it on.
Bigger is better so it wont warm up your water, i can run mine all night, mine has run pretty much 24/7 for the last 10 days and today it gets shut down.
Just use plain tap water, don't adjust Ph.
Be afraid of going too hot, but don't be afraid of going too cold.
They seem to really enjoy colder temps here and there, kind of mimicks real world conditions for I'm sure roots get cold water from time to time.
Colder temps, like 62-64 they seem to enjoy, that with a manifold that sits closer to the stems. Those stems are closer to the water giving off loads of oxygen.
Cut your stems under water, then just dip em and stick em.
I had one stem that didn't look the best after it almost died in the dwc cloner.
I mixed a little Clonex in some water and mixed it all through until 100% mixed, i cut the rotted part of them stem off, scrapped the edges of
the stem and then put it into the water/clonex mix and re-cut the bottom of the stem right beneath the node.
I then dipped that stem into a separate container with just Clonex and threw it in there.
Pic below is of that stem which was saved.
A good pump will send that mist right up below your collars, you can see the roots that popped out from the highest node.
But technically they were all saved from the dwc cloner, the temps they saw that day was way too hot, so i realized even if stems look like they wont root they will, you can save them as long as their not too gone.
Upload pics to this thread of your CM if you want, share you dimensions and i'll tell you if i can help with anything.
Just remember I'm new to this and can only help with what i have recently learnt.