I have all the same workstations, same specs/hardware. I recently upgraded to 11 sp1 . I am trying to image some of the pc's but when then image completes and reboots, i get duplicate name exists. When I login to the machine sure enough the image gave it the same name from which the master image came from. Before I uploaded the image I did the following.

zac cc
I deleted the 2 guid files.
Ran ziswin and cleared isd then answered no to the prompt.
Added zac reg -g to the run once registry

I have the zen agent installed on the image as well.

I want the pc after reimaging to keep its original name.