NiCr 80 is for use with watt/power mode.
How many wraps depends on your target resistance & inside diameter of the coil.
How many watts depends on several variables & mostly personal preferences.
I don't care for NiCr, you might like it, no telling.
If your vape tastes like burnt metal probably user error.
Settings, airflow, too much power, improper wicking to name a few.