safety first! I use a multimeter, then hook it up to a regulated device and measure it again...cloud chasing has much more to do with the batteries, type of atty, e juice used, and coil build then the actual mod itself....this question has been asked on here a lot, just search for 'clouds' or 'cloud chasing' and something will pop up that will help you some more.
I'd think a dual battery box mod is probably something worth looking at.