How to set tessellation control parameters

I have the set tessellation parameters as below:

• step size is assigned with model size ( diagonal of the bounding box ) / 30.
• chord height is set by fetching the model accuracy using the GetAbsoluteAccuracy() method.
• Angle control is set to 1.

I am not getting a better result using this. The quality and the curves or circles in the model are not accurate.

I am using creo parametric object toolkit version 8.0.2.