I think a lot of people have trouble with the slow zone, anyhow as you probably know by now the the soft max and soft min is the size of your working and when running a program it uses this information to check you are not trying to machine outside this area, Slow zone....don't know never used it, but I think the axis should slow down in this area when you run a program near the axis limits, Home off is the amount the table/axis moves back after touching a homing switch, home negative is the direction the axis moves after tripping the axis limit switch and could be positive or negative depending on which end of the axis the trip switch is located, Auto zero resets the DRO in the display to zero to set up a machine datum and speed% is the % of rapid you use for referencing the machine, ie rapids=10meters per min, if set at 20%, referencing would be 2meters per min.
I expect you have found all this out by now and I'm preaching to the converted, if not, I hope it's been of use.

jim.