This was previously fixed in XRI 3.0.6 with the addition of a checkbox that turns on the same live sphere-casting debug view that the physics debugging shows. The estimated visual of cone casting is to help guide the maximum size of the sphere cast at a distance and not meant to represent the physics 1-to-1. When the angle is too large, the result is effectively a sphere cast. We will be adding some constraints to this angle in a future version of XRI for both performance and usability reasons.