I think VV/VW are two separate things, they don't have anything to do with each other. Voltage is more like manually changing it depending on the ohms of your coil, because a lower resistance coil requires a higher wattage or something like that whereas when you use just variable watts, it takes the coil resistance into consideration already.
My pen is small, so there's no way I could probably get huge clouds since it's also a prebuilt and there's very few things I could change about it :/
It's not that my vapor clouds are small, it's just that they're not really that thick to blow rings well enough.
I'm not so sure about how the flavor works either, it's kind of weak for me but I suppose that's because I'm using only 20/80? Even if I increase the pg, I would have less vapor and that would suck...*sigh* the trade offs are terrible
Edit: Oh, I forgot to mention, but this helped me a lot with the voltage thing.
http://allaboute-cigarettes.proboards.com/thread/8815/eureka-volts-ohms-watts-101