The game maxes out at 1.642857 (which is 115 hdeg 4:3), and this is enforced by the calculator to avoid errors.
If you used 1.7 before this enforcement was in place, the old calculations were wrong.
Despite being named the same, they are not identical. They don't have the same FOV, so their 360 distance will be different with your calculation.
https://www.mouse-sensitivity.com/?share=08ae9e61281f43366d852ce341f297f0