I use round coil, single wire, SS316, 0.6ohm, 22w.
I tried TC preset SS at 230°C just now and it's also fine. So thank you, Izan!
But, as mentioned, when I used TC with TCR on 87 to 92, as advised, I had to fire it around 280°C and it doesn't seem to me accurate too. That's why I wrote my post...