Seeking advise on use of HalfTone V1.7

I also posted this on the Face Book Forum seeking advise. Has anyone used HalfToner V1.7? If so, how do you set the thickness of the material. I import to Easel and set the Z to zero with the Probe and when carving the bit is about an 1/8 of an inch above the material. I do again, manually setting the Z to zero and when carving, same thing.