EDITED to fix two errors:
This can be easily done at stock voltage mem@300 core@940. You only need to replace cooling paste with Arctic silver. Usage is about 180... And I have tested your settings. I think you need batter kill-a-watt. I can't make it run with the usage that you reported last time... It uses about 120W+. If I remember correct you reported 85W.
aka STALE/INVALID shares in your miner client
It currently running for 10 hours. Non reported... And no HW errors.