Launching 2 Google Chrome windows in different positions

I am trying to create shortcuts (to eventually add to startup folder) on Windows 7 that will launch Google Chrome as two differently sized window at two different positions, in app mode.

I have two shortcuts:

"C:\Program Files\Google\Chrome\Application\chrome.exe" --app=http://www.example.com --window-size=400,300 --window-position=200,200

and:

"C:\Program Files\Google\Chrome\Application\chrome.exe" --app=http://www.example.com --window-size=400,300 --window-position=600,200

That should launch the first window 400px x 300px, 200px from the left and 200px from the top.

The second window shout launch 400px x 300px, 600px from the left and 200px from the top.

Whichever window I launch first works correctly. If I launch the first shortcut first it launches 200px from the left, if I launch the second first it launches 600px from the top.

However, whichever I launch second launches in the same position as the first.

How can I make these work independently from eachother so whichever I launch does not snap to the position of the first window launched?