The degree of TH that a vaper gets is entirely subjective - YMMV, and all that - but the following can have a significant effect.
* PG heavy liquids - more PG = more throat hit and more flavor (but less vapor).
* Wattage - using a low-resistance coil at 3.7V will increase the heat-output of the coil - but carries a higher risk of burning the juice and/or wicking material.
* Coil surface area - dual coils have twice the heating area of single coils and heat a larger area of juice-soaked carto filler. However, a single coil at a higher resistance and higher voltage can heat the carto more slowly, seeming to produce a 'better' vape.
But, in the end, if the Smoktek DCC's work well for you and you like them then they are doing a good job!
