You sir, are at the end of the road with it. Lol just like everyone else.
The only other way to make more power, includes soldering, and some more in depth modification. There is a great written guide right here.
This guide does go over how to really by pass the 120% limit, and add voltage to memory, and GPU. It is not for the faint of heart. If you are not experienced, and you love your (1) and only GTX1080 you have like me, then you will not attempt this. Good luck!
Edited by tps3443 - 9/27/16 at 8:24pm