I think the calculator is wrong about various aim/scope values while "all" Aim is selected.
For reference, I'm using vertical monitor distance at 0% on every conversion setting. My EFT field of view is 70.
So, if you select a specific scope within the Aim dropdown, the bottom of the output will tell you that scope's FOV.
The 1x/Reflex/Holo gives me 55 vertical FOV. No attachment ADS reads 55, so does the Walther reflex.
Yet, their sens values are different in the output list when you choose "all" from the Aim dropdown:
I may be missing something here, but I went ahead and used the hipfire conversion set to 55 FOV and it gave me a value closer to what I'd expect (0.136859). Gonna try that out for my aiming sens.
Apologies if this has been discussed earlier in this thread