780 ti classified droop

[buzzram]

I recently bought two 780ti classified and tying to understand them a bit (ambient for now, will see i I can afford something exotic in te future) and basically I couldn't stabilize it above 1258 gpu clock which is +95 offset in precision, no way to stabilize it at +100 (both normal and ln2 bios) and I noticed that if i increase NVVDD in the classified controller it droops much more than it's doing whith stock NVVDD, starting from 1.18 i would get 1.17V on load but then when i raise it to 1.2v it droops to 1.16 and of course less stable, i really don't know the reason but i don't think the problem was temperature because it was on a morpheus II and max reported temp was 45c. Should  I just raise NVVDD more until it droops to the volt I want or there is some weirdness in the bios maybe that can be adjusted? Any hints?