I'm wondering if your fused SS build that has very low ohms is causing this? I have no idea, but some setups can get so complicated, that it may be hard for temp control to read them? It's just a guess, but you certainly can run it in either wattage or temp.
I had no problem using temp with a single coil, around 1.14 ohms SS316L coil in temp control with my Steampunk, which I think has a pretty well-made TC system, but I don't know as much about your mod, I apologize. I think with any new mode though, starting out simply may help you. I'd wrap something of slightly higher resistance if you can, or maybe a single, spaced coil?
Best of luck, I am sure you will get it sorted out with the assistance of the group!
Welcome to ECF!
Anna