Running outing out of juice is exactly what its like. I have (3) 1500 watt platinum PS’s and have an actual power meter on the electrical feed to the rig. It runs at 1900 to 2100 watts when 9 GPU’s are mining.
I did downgrade fro 417.17 based on comments of people having issues.
I have not tired any other algo’s as I am running cuckoo 31 for AE. Grim is slightly different from what I have heard but seems to be close enough to have the same issues mining with essentially identical rigs. I will try enabling another GPU today and see if it crashes again. 9 seems stable right now but I did schedule a auto reboot every few hours.