Why does Blender hair not work for life-sized models?

Hi,

I have models that are real life scale in Blender. But when I add hair, the presets are way off:

Notice the 1 meter cube in both shots - for scale reference.

Example 1: Simple hair with children on lifesize head, clumps are way huge!!


In the above I have to turn the clump size all the way to -1 before hair begins to look normal again, but it’s still not perfect.

Example 2: Extremely large head scale. Now clumps look normal:


In this example I had to scale the scalp up by 10 then the clumps looked ok, but the rest of the model is now very small.

I do not have the option to scale the model because I am using motion capture software and the model must remain life-size.

Why does blender hair not work on life-size characters? Why must they be house sized before the defaults look ok?

How do I scale all values of the hair down by 10 so I can work in the desired “size space” for my application?

Thank you

[EDIT]
By scaling the “radius” value from 0.2 to 0.02 solved the clumping issue. Strange that something called radius would be responsible for positional spacing, anyways I think I’m good now.