Navmesh resolution limit?

So it seems that the lower limit on tile size uu is fixed to 560. Can this be unlocked in the config file?

In general, is there a better way to allow the navmesh to follow geometry collision more closely? You can see the issue I am having here where
the nav mesh does not resolve the bottom of the slope with the flat surface accurately. I am testing this for VR, so would like to have the nav position
be as close to the geometry shape as possible.