Leaking through the airflow, spit-back and gurgling is a clear indication the deck is flooded. I also own the Zeus Dual. And given it is in rotation with many other atomizers, it spends much of its time filled with juice on its side, upside down or being knocked around by my cat….it does not leak!
You want your cotton wicks to be cut just so they are filling the juice ports without voids and loose enough to slightly move freely. This may take some trial and error. Too tight and the coils will not saturate – too loose and you will over saturate the coils.