My foray into throwing porcelain - the glaze is new too - Coyote Crazed Copper - that didn't craze.   Pretty but not exactly what I planned.  After consulting with Coyote, I found that several things made a difference:  1)  being patient  - the crazing seems to take a bit longer to appear - on a couple of pieces, I discovered crazing a week after taking the piece out of the kiln  2) a thicker application of the glaze - since I was afraid of the glaze running and dripping onto the kiln shelves, I was a bit tepid on first try.  I did subsequent pieces with thicker applications and those crazed.  3) Coyote also suggested that clay compatibility might be part of the problem, but eventually I found that the glaze crazed on both the stoneware as well as the porcelain we use.  pretty glaze.