I am using 0,125 ohm, like in your setup.
I just tested with device monitor:
With 0,138 ohm and TCR200 I get constant 40W power draw when firing and drawing, it never goes down
With 0,125 ohm and TCR200 I get a short heatup with 40W, then it drops down to almost 0, and when I draw I get a some...