Don't know much about the ECO coil heads for the Tarot, but the Ccell coils for the Target, those are a really different animal, the wicking is made of ceramic fiber and really needs gentle handling and very, very gentle breaking in, thus have to be slowly ramped up in watts gradually as you break them in after a long coil priming. Once properly broken in due to their surface area and the coil material I believe is what is called a notch coil, band of flat metal with notches punched into it, really give a lot of surface area and due to the ceramic wicking a very, very clean flavor. Another thing you could do, if you really like the Tarot Nano is to get another then use anything as simple as colored electrical tape or nail polish dots on the casing to distinguish whose is whose mod if they don't have alternate colors for the mods. But the Target Ccell coils are a pain in the tail end to get used to breaking those coils in properly, do it wrong and you'll burn the ceramic wicking up faster than you can believe if not careful and you'll be really having a bitch fest with yourself before long.