In my experience, TC coils haven't worked as well in RDA's than they do in tanks. With tanks, there is a constant supply of juice, so you don't get the burnt taste when the coils gunk up. With a dripper, once the coil gunks up, you get a burnt taste once the coil starts to run dry (but not dry enough where you get a burnt hit).
This is why I stopped using TC coils in RDA's. With the juices I've been using, the coils will turn black within a day. With Ni and Ti wire, since you can't dry burn the coil to vaporize all that burnt on juice, it is a bear to clean. With kanthal, I can just fire the coils until they glow and the coils are clean as new again. With the Aromamizer, the coil and the wick can be black and because it is a tank and it constantly replenishes the juice to the coil, it still tastes as good as a brand new coil and wick.