Well some more playing with this mobo has paid off!
Flashed to the offical F4 BIOS, set all voltages to default and just set the ram timings manually and i was finally able to break under 14s doing 1m PI at my highest clock so far on this mobo of 3681MHz.
Thats a bloody good speed for default voltages.
What voltages are you reporting under load. I ask because i had some fun with a DS3 on the weekend and even though i set the Vcore to auto it seemed to up itself with the speed. Is it a gigabyte feature or was the board i was playing with strange or is easy tune just a POS and doesnt know what it is talking about.