I don't chase clouds. I do get great vapor with a regular mech (Reo, Nzonic etc.) and coils at about 1.1-1.4. I have used lower resistance a couple times when I went with dual coils or just wrapped to few times. I am getting clouds from my kayfun at 1.1 with rayon wick.
I guess I am saying, if you are chasing HUGE clouds, yep, get the 30 watt and go sub ohm, and go high on the vg. VG = clouds, PG = flavor and throat hit. If you are chasing HUGE clouds, you will be into rebuildables in no time. Just learn a lot about your batteries and battery safety. (If you don't already have that information...not trying to say you don't, just a caution).