Thanks for the feedback. Please note that before version 6.8.3 of Awesome Miner, the Mining Profile selection if made via Awesome Miner wasn't always correctly applied. If you use the latest Awesome Miner version or select the Mining Profile directly from the Antminer web interface it should work better.
The feedback I've received from other users is that they get to 14.7TH/s - 15.5TH/s on their S9 miners. In your case I assume your are looking for the lowest possible power usage and it might be that there are less room for improvements in that end.
When you use the Update firmware feature in Awesome Miner, it will do "Keep settings" as it's called in the web interface. Have you made a full reset of the settings when you are on the Bitmain firmware to make sure all custom properties in bmminer.conf are removed? Once your bmminer.conf is default the Bitmain firmware should perform exactly like before.
I'm using the latest version.
Regarding consumption you are right it appears that there is very little room for improvement (hot summer trying to wer the heat as much as possible)
I did without keep settings option but no luck .....
Thanks for the update. Do you measure the power usage at the wall?
For Bitmain firmware, Awesome Miner doesn't have any way to display the actual power usage - it's only based on what you have entered in your profiles in Awesome Miner. For the Awesome Miner Antminer firmware, the firmware can report a decent estimate of the actual power usage (if you have configured "Actual usage" in the Options dialog, Profitability section).