These are the replacement coils which are supplied with the R40TC -
The Micro CLP2 is a dual core fused Clapton at 0.3 Ohms rated at 30 - 60 Watts. A lot of vapour for not much power.
The Micro MTL is a single core Clapton at 1.8 Ohms rated at 15 - 30 Watts for mouth-to-lung vaping.
There are other coils in the TFV4 Micro range that may be suitable for the Micro Basic tank.