Contrary to what Steve said, I don't think dual coils are going to be at their best unless you can hit them with a lot of power. A 1.5ohm DC is just 2 3-ohm coils in parallel (2 ohm DC is a pair of 4-ohm coils in parallel, etc.), and it doesn't seem like they'd be at their peak until you're hitting them with enough power to actually drive each individual coil. But I also haven't used one, so that may not be completely right. I just haven't bothered because what I know about electronics says they shouldn't work well.
But they're still worth trying. So are single coil cartos. You might like them better than what you're using. If not, then you support your preference.
Personally, I don't really like cartos. For me, they don't vape any better than the clearos I've tried (vivi novas and Kanger T2s, of which I prefer the VN) and I hate how they fail; all of the cartos I had in a tank would just start flooding at some point on day 2 or 3 and were basically unusable at that point. Considering that they weren't any better, I figured that $1.60 every few days was too much to pay compared to a $3 VN head that lasts several weeks or possibly months and can change flavors easily.
Still……give them a try. You might have a better experience than I did.