Here is a plot of the range on the ZM1 osems at the time of the OMC scan Haocun posted here 43723.  This was done with the SRM alignment similar to the alignment we use for the locking the IFO.

The plot on the left shows the osem centering, the range is +/- 500, the plot on the right shows the DAC counts requested for the actuators, the range is +/- 32000 counts.  

It seems like the range on ZM1 is fine.