Hi @Andrea_Matera,
Same question here as I have a 8 levels Novo Mag force and I use a speed and cadence sensor. Level 3 for me definitely overestimates my power. I think 4 is more realistic. Looks like Zwift implemented the level 3 power curve for the 5 levels Novo Mag Force, but didn’t implement any power curve for the 8 levels model🤔… So for now I use level 4/8 on my trainer.
If anyone knows better I’d be more than happy to hear
FYI another conversation on the topic: