Attached Link: 3D Menagerie (tutorials under "Goodies")

hmmm... why are you trying to keep the green zone out of the red? are you talking about the matspheres or the bend-x controls? if you mean the matspheres, the green zone should be IN the red zone, although it doesnt matter if they overlap. also, pay attention to the blend zones BETWEEN the red and green, and not so much on the green and the red by themselves. try my quickie tutorial on joint editing at 3d menagerie, and see if that clears anything up for you.