Could you explain that a little bit more? I'm just trying to understand it, I had been firing it at 15.3W from yesterday afternoon, and it's been fine until now? And the display says 7W and 2.03 volts?
It's doesn't have true stepdown. So when it reads 7W and 2.03V, it's really sending more like 3.6V to the coil.
This is a great little mod, but this is one of the limitations that needs to be understood.