nine GPUs, nice rig bro! decent RX580 can achieve 1200+ and even 1250+ with good modding.
JCE your newest miner is top notch, I'm getting 1350 h/s stable on rx 580 8gb.
How?
1.1-1.2v I would guess...

It's abot 150 Watts... Noo, better 1150 h/s on 100 Watt.
I get 1120-1170 on 6 gigabytes and 1220-1230 on 6 samsung rx580 at 950mv (80-83watts overall average)
Sorry, but 950mv is not doing 80-83w. I'm assuming you're looking at HWinfo or GPU-z which are not complete, and/or you're forgetting to add in your idle (15w) which still would be too low.
Including idle, at the wall, i see 105-110 @ 850-860mv (1200-1265h/r depending on mem type)