Greg...
I pulled an INI copy from my shop that has my notes. my line (in the Z axis section) reads "axisadj= a2 v2 u13 d14 i1 but you would most likely use "axisadj=t1 a2 v{1 to 5} i1" to use transit keys [PGUP] PGDN] to adjust the axis. There is no fixed amount setting, but with a little playing I can get "1 tap = .001" with 2 as the velocity setting.
Use parameters 'b" and "s" to setup and toggle the alternate (W) head, I don't have that experience.
The "adj" will only be applied to one axis (2=Z) in my case, unless the proper input is triggered to toggle to W
Hope this helps. I do have more info on this, but would have to dig out my old notebook.