Heliox - just to update that I managed to get the -175mV working on the new batch of Nanos.

I have not got all 6 cards in a complete setup yet, but testing on 1 card is a success.
I will run it overnight before flashing the other cards.
I will report the kill-lo-watt meter readings tomorrow morning.

As of now, with -175mV rom:
-6mV,1040/300 = 30.3MHs at fans= fix 60%, temps 67-68c
and
stock -175mV,800/300 = 22.4MHs, temps 62-63c, auto fans

I am tempted to try the -200mV rom.

Is it normal that some rigs will have 150 roms and some 175 roms, mixed configs in your environment?