Mike,
The High Precision property data format is used by some properties in the set called "DuctEngineeringData." This is a specialty hard coded property set that our duct objects interface with. We change this, it's likely to break other unintentional areas. You should create a new property data format based on High Precision that is set your way. It can reside in your template and would always be available.
Joshua
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Joshua Benoist, PE
Senior Premium Services Specialist
Global Services
Autodesk, Inc.