AppleScript to add computers to a computer list

I would like to use AppleScript to add computers to a computer list in ARD. Each morning I get a list of Macs that are supposed to be running automations but the automation server has lost contact with some. I then have to figure out why. Some mornings there are three and it's easy but some mornings there are 60. I've figured out the way to parse the list of Macs. However, I've had no success setting up an AppleScript to "control" each of the offending Macs (and I'm testing with ones that are active). Nor have I had luck adding the Macs to an existing list. The Macs are all already in All Computers. Even trying to add one single Mac has been unsuccessful. When I run this script ARD pops to the front but nothing happens.

set remoteComputer to "deadMac001" as text

tell application "Remote Desktop"

activate

add remoteComputer to computer list "Test List"

end tell

It would seem through my testing that adding a computer from scratch you need to know the IP address. But these Macs are already in my ARD I don't need to add them to ARD I just need to add them to a computer list. Any suggestions would be appreciated! At work I'm up-to-date with El Capitan 10.11.4 and ARD 3.8.

-Doug