Having torch height issues. When I run a program, floating z axis moves down to surface, zero's and moves back to 2" rapid travel depth. Goes to start of cut, sets to plunge depth, then transitions to cut depth. However the floating z is .2" away from its stop - torch head is .2" too deep. I have set the switch travel, pierce depth, and cut depth in mach and the pierce height and cut height in sheetcam. Anybody have any thoughts as to what is happening here ?