Thanks to Soothaa continuing after I gave up. I can now run 7 570s on my 170a boards!
Anyhow, I've been carefully watching my power usage due to having to make sure I'm balancing the load of my machines across circuits. I'm not doing anything with the bios tuning to try and lower my power but I do set all them to power stage 4. With that, a 7 gpu rig runs under 1000w at the wall or just under 9 amps.