Some weird hashrates here. Two 1080's hashing at 52Mh/s, three at 44. All exact same clock settings... Not too sure what causes the differences.
Put your energy in 60%, it will have a gain superior to other minerals and will not melt your welds, so you will lose your gpu.
Core clock +190, memory clock 0 and fans 80/87%.
And can you tell, how you can lower voltage on Nvidia.
I'm really curious.