I have a problem on a weight map.

I am using G5 eddie basketball avatar. I am adding a weight map to the shorts.  (http://www.reallusion.com/ContentStore/ccdproduct.aspx?contentid=AIC551CIENU012020140910003)
 1st I added the collision shape to the avatar and edit the shorts weight map in PS. 
 2nd I added a running motion to the avatar in Frame Mode and it works fine.

However when I play it Realtime Mode the cloth still goes through the avatars leg. Now I edit the map a few times to gray some of the white areas but still the cloth breaks through.
Is there a way to fine tune this specific weight map