High Order of Distortion Coefficient, but low power of the value

I am successfully building up the camera calibration by using high-resolution camera in 14 different angle of images, error RMS within 0.4

After doing many research, I am still facing a question.
No precise Distortion Coefficient in K1, K2 K3 (If rational model, K4, K5, K6, naturally, no correct result. As I can doing mathematical way to create a design value in e-10, however, the value return about e-2~e-3 as minimum. Is there any way to enhance the power of distortion coefficient by cv::API?

Thanks for the discussion.

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