Magic wand settings influence all outline tracing tools.
If you set it to Linear segments, than you get polygons with as many sides as set.
If you set to Best match, the outline will be approximated to the max number of linear segments that you set - 36 is a good balance between precision and the polygon count. If you have arcs with large radius, use segments per arc, not per circle.
In general, forget Deviation from curves.
Djordje
ArchiCAD since 4.55 ... 1995
HP Omen