Yea i should have added, this was only for hipfire vFOV at 73.74 (this is wat i use).
I haven't tried another FOV so perhaps that 2.364 figure is purely for 73.74.
But i've tried limits of 1.5/1.78/2 and at vFOV hipfire 73.74, the power of 2.364 (zoom scaling) matches very closely to power of 2 (FOV scaling). This has been done x1, 1.25, 1.5, 2, 3.0, 6.0 zoom (Battlefield series, COD etc).
I will play around with another hipfire vFOV out of curiosity though. I just plugging numbers and observed that. =/