Wds on Dlink-1353 802.11N Protocol

Dear Sirs , i have build a visio Diagram for my existing network configuration.

In this setup i use Dlink 1353 N protocol , which is communcate with WDS-AP Protocol each other following by an arrow!

The distance between horizontal devices , are 10 metres. All devices are talk to the same channel '11' and of course i have different SSID on each device so i can debug it more easy! , the Signal level of each device is pretty GOOD.
I have problem with this setup , in the last WDS-AP (Wifi-9) i have aaaaa lot of packet loss pretty strange , maybe i have put a lot of devices? , i don't know what is wrong can someone help me what is the most right setup for this situation?

Thanks

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