Full Duplex WiFi setup with 4 AP/Wireless ethernet bridges

Hi

I have tried for some days to setup a full duplex wireless configuration after seeing http://gregsowell.com/?p=2493 without success. I also have looked at http://blog.butchevans.com/2008/10/using-ospf-to-create-full-duplex-behaviour-for-wireless-links/

Setup as follows [see below picture]

2ea R450G v6.31
4ea Asus Routers flashed with tomato firmware

The Asus routers are setup in AP/ Wireless ethernet bridge and are functional in transfering data when you run them separatly

I have tried back and forth with both above suggested configs without fully success.

Can somebody helpout me with a functional setup like Gregs example and using the 4 external Asus Routers?

Kind regards
setup.png