The HFOV values for some scopes are wrong.
Hipfire: correct
ADS: correct
2x: wrong! 55° -> ~ 50°
4x: wrong! 28° -> ~ 25°
6x: wrong! 18.67° -> ~ 16.67°
8x: wrong! 14° -> ~ 12.5°
My suggested values may not be perfectly accurate, but they are a lot closer. I tested it.
Sensitivity_Calculation.xlsx
Sensitivity_Calculation.xlsx