Alcatraz

I think I know what the issues is. Bioshock Infinite is the only game I've ever encountered where the WPS setting doesn't scale to the Windows norm, i.e.
6 = 1/1 5 = 3/8 4 = 1/4 3 = 1/8  etc Instead it's:
6 = 1/1 5 = 0.8 4 = 0.6 3 = 0.4 But the code currently only supports the Control Panel WPS values (1-11), there are gaps for the registry config which are missing. I think that's what's throwing the calculation off.
I'll take a closer look at this, they might even have changed the scaling since it was first analyzed for all I know.

This is an old thread full of misconceptions and bad ideas. 0% will always be the only way to convert the sensitivity. Anything else is generating a new sensitivity that preserves a characteristic of the old sensitivity.
 
You got two viable options for consistency:
Convert 0% from a single source to everything. One universal sensitivity. Low fov and high fov games will have different mousing for navigation. Maintain a constant hipfire cm/360° for consistent navigation and convert 0% to ads/scopes (anything that changes the fov) to maintain the same sensitivity relative to the hipfire. You end up having a different sensitivity for each game, but it is muscle memory associated per game.