I don't remember exactly of Shade-c EVO shadowmapping, as I remember it utilizes an exponential shadowmapping. If I am right, you should increase the exponential shadowmapping constant (or factor), or to decrease shadowmapping depth distance, to eliminate that bad fade out at legs. Increasing resolution, and decreasing shadowmapping area also should help. (in reality, shadows should be sharp at legs and blurred at more distant parts)
The best is to create a tool where you can tweak all parameters in real time, that would save you a lot of time. I did it in MapBuilder, it really does worth the time!
Or ask JCL to integrate it into WED