You’ve made a mistake in your calculations and chosen the wrong build/watts ratio.
High watts require fat and big coils. Bigger coils require more watts to heat them up. If you have stuffed your atomizer with small clapton coils, fuse coils, or, Heaven forbid, micro coils, and decided to heat it up at 150+ watts, you have a good chance to feel immediately a strong burnt taste. The reason is quite simple — the coil weight is too low with regard to its power. Coils become red-hot in the split second. No matter how much amount of juice was on your coils at that moment, it’ll evaporate in a twinkle, and then the coil will make the dry wick burn to flame. The result is the burnt taste.