Here is a small selection of images showing the visual trade-offs involved with three settings for radius, and three for threshold, all using the same adjusted curve:

SETTING	IMAGE
Radius 8, Threshold 0.5
Radius 75, Threshold 0.5
Radius 250, Threshold 0.5
Threshold 0.1, Radius 50
Threshold 0.9, Radius 50
Threshold 4.0, Radius 50

Both of these contrast enhancement settings, as well as any edits you make to the curve, are very much “season to taste” adjustments. Which values work best will depend on the scene (its breadth of DR and areas of detail) and the interpretation you intend to show. There is no “right” answer, although naturally there are many “wrong” answers.

In the end I wound up with these HDR Conversion panel settings:

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