Looking really good!
Here are few questions.
Have you flashed any of your cards?
What drivers are you using? AMD Crimson block chain or regular newest drivers? As with the same card on my system I cant reach the speeds close to yours using regular non block chain drivers.
Did you work on specific windows settings?
Yes i flashed all of them i copy timing from 1:1750 and paste it on 1:2000
Here is the driver that iam using
http://prntscr.com/hsyc8dAnd i used this to tweak my windows
https://mega.nz/#!8gZzjQaa!Dt4wE0WEo8nZkui_-cAAXL4mb4YlO6CJgFZTXKq9pnQ
and also i increased my Virtual Memory
INCREASE VIRTUAL MEMORY
In search type This PC, right click on it and choose Properties
Then click on Advanced System Settings
On Advanced tab where it says Performance click on Settings
Click Advanced tab
At the bottom you will see Virtual memory, click on Change
1. Uncheck Automatically manage paging file size for all drives
2. Check Custom size
3. In the Initial size (MB) type: 16000 (or directly 16000)
4. In the Maximum size (MB) type: 20000 (or more like 20k)
5. Click Set , then OK and Apply
Restart the rig