Blob Shadow Dynamic FarClipPlane Distance

I'm dynamically adjusting the far clip plane so that the shadow only displays on the first surface it hits. My problem is the shadow isn't dark enough below the player unless the far clip plane is significantly farther than it should be; it has to be far enough to slightly show on an area below (where it shouldn't) before it is as dark as I want it directly below the player. Should I tweak the material or is there something I'm overlooking I could tweak in the projector?