Get the ohms right 1st...before you spend $$$$$$$$$ on new devices (Unless you really want to).
An e-cig is just applying power to a coil. There's 100's of ways to do that..hence all the devices on the market. Some are better than others, but basically you can do it with 2 wires, a connector, and a battery.
So match the ohms to the voltage. Dual coils require you to realize that there's two coils of 2x ohms (where x is the DCC's ohm rating).
If you tell us what ohms that DCC is, and give us a link to the device...we can help you match it up.
Like one mod here frequently says...get good with what you have before you go chasing the "ultimate vape". I agree.
You complaint above is that it's quite hot. So you have plenty of power in the device, I would guess.