I'd suggest staying with the coil series you have been running up to this point
http:// w w w .madvapes.com/t-series-replacement-bottom-coils-small-slot.html
However instead of the 1.5ohm coils, go with either the 2.0ohm or 1.8ohm coils
However if you are looking for an adjustable airflow tank that will work really well with that Nzonic Clone, I'd suggest a KangerTech AeroTank, Aspire Nautilus, or Aspire Nautilus Mini
http:// w w w .madvapes.com/t-series-replacement-bottom-coils-small-slot.html
However instead of the 1.5ohm coils, go with either the 2.0ohm or 1.8ohm coils
However if you are looking for an adjustable airflow tank that will work really well with that Nzonic Clone, I'd suggest a KangerTech AeroTank, Aspire Nautilus, or Aspire Nautilus Mini