First off, if you want clouds, buy a RDA (rebuildable drip atomizer) with lots of air flow. Use 6 to 7 wraps of A1 Kanthal on a 3.0 to 3.5 id core. (4.0 if possible if your rda deck is big enough) and dual coils. Drip juice on your coils often.
Using the coils that came with your BB tank or any premade coils for that matter, is like entering a Nascar race with an off the lot soccer mom special. Even if you use ultra unleaded gas, you wont be getting the speed of a custom built car.
Now if you just want more cloud with what you have.. lower ohm, generally means larger coils. So a 0.15ohm coil produces more cloud than a 0.50 ohm coil.
MutationX V4 quad coil build