I don't know what VTH is, vertical tracking height perhaps?
Generally speaking, cartridges are designed so that they have the correct VTA* and SRA** when the mounting surface of the cartridge body is parallel to the record. So, assuming that the cartridge is mounted flush with the surface of the headshell, you'll have the correct SRA/VTA when the arm and headshell are parallel to the record's surface. Both SRA and VTA are also influenced by the amount of VTF*** applied. Too much will cause the cantilever to deflect more than intended, putting the VTA at too shallow an angle and the SRA to lean backward. Too little VTF will cause the reverse to occur. The 412 STR likes about 1.8g.
John
*VTA (Vertical Tracking Angle) is the angle between the cantilever and the playing surface of the record. Generally, it's 20° +/- 5°.
**SRA (Stylus Rake Angle) is the angle between the stylus, as determined by its vertical axis, and the record surface.
***VTF (Vertical Tracking Force) is the amount of pressure the stylus exerts on the record, measured in grams or fractions of grams.