Have you tried setting both the second and the third v3's to not cast shadows? as they basically cast the same shadow as the primary v3, there shouldbe no change in the casted shadows appearence, but may fix the issue you are having

otherwise, have you tried changing the min shading bias and other raytrace options onthe shadow casting light? if not, show us your shadow settings and we can see what options you ahve

TemplarGFX
3D Hobbyist since 1996
I use poser native units

167 Car Materials for Poser