I have done a few more tests now after the box had been sitting for a whole afternoon by itself while I was out. I input the new room temp Ohms and now the box doesn't give me the temp protected msg anymore, which is a step forward, but now it only reaches 150C instead of the target 220C. No matter if I increase or lower the watts, it keeps firing at max 150C.
Here are my tests:
Minimum temp (93.3C), 30W: Steady 94C @3Watts
150C, 30W: Pretty steady 150C
200C, 30W: Stays on 150C
200C, 40W: Still barely higher than 150C
I'm using Profile 7, I added 316L wire material from Steam Engine. With Profile 6 I have even lower temperatures (last tests gave me 141C).